If you had a dollar for every character in movies and TV shows being a Sir Swears-a-Lot who speak in Cluster F Bombs; or how often any of the initially sympathetic characters, at their worst, yells out their Precision F Strikes occasionally, were being assholes; you could conceivably rival the filmmakers' fortune.
It's Happy Bunny in a nutshell. And he has one or two amusing slogans; the rest are simply insulting without being funny. TSEEEEEEEEEER!
Some fans of certain genres are real jackasses straight from the get-go. Not only do they bash other people for their musical tastes, but they also act like they're allowed to and others cannot defend themselves.
Some metal fans are this way to other metalheads, particularly if they are the type that listen to the most 'brutal' subgenres and deem everything else to be 'too mainstream' and therefore 'not true metal'.
Al Mu'min of The HAARP Machine's jerkass behaviour is well documented, and it is the reason why his band is a Revolving Door. Amongst other things, he has sent threatening e-mails to ex-members and allegedly once threatened to burn somebody's house down.
Dave Mustaine, especially during his time in Metallica.
Denis Leary's signature song "Asshole" (and arguably, his entire stand-up career) is a celebration of this trope. Leary himself is actually a case of Mean Character, Nice Actor.
While it's rather hard to tell whether or not they actually were like this, The Sex Pistols certainly presented themselves this way, much to the horror of Moral Guardians and awe of fans.
John Lydon's passive-aggressive interview style often makes it unclear whether he is angry at the interviewer or not. Usually he makes good points, but is often frustrated with the inane or poorly informed questions asked of him.
Kam Lee is legendary for his incredibly unpleasant personality. Granted, Chuck had documented ego issues and it's natural that people would butt heads with him over it, but Lee has a lengthy history of burning bridges with people and making enemies with others, and his behavior in interviews is a pretty damning indication of what he's truly like. Chuck most likely aimed "Low Life" at him, and based on what others have said about Lee, it's absolutely spot-on.
Blake Judd (Nachtmystium, Hate Meditation, Twilight, etc.) is a notorious con artist, ripoff merchant, and pathological liar whose record label, Battle Kommand Records, gradually became known for orders that never arrived and correspondence that was always cut off whenever anyone inquired about missing orders. While his well-documented drug problems certainly fed into it, his total unwillingness to accept responsibility for any of his negative actions until he ran into legal trouble (for stealing and pawning a roommate's guitar) did not endear him to anyone, and neither did his habits of banning anyone who asked about missing orders from Nachtmystium's Facebook page and hiding from people that he owed money to in real life (there have even been multiple allegations that he fled out the back door of venues that Nachtmystium was playing at if he spotted someone who he suspected was there to confront him). While he did publicly admit to his drug problems and apologized about his actions after he was arrested on theft charges, he clearly did not learn a single thing from the ordeal and quite possibly meant absolutely none of what he said, as reports that he has returned to his old ways have started trickling in again in the wake of multiple people reporting that they have not received their preorders of the new Nachtmystium album from him; this turned out to be the last straw with Century Media Records, as it was enough to get them to step in to rectify the situation, which involved sending all the missing preorders themselves, throwing Nachtmystium off of the label, and blacklisting Judd. According to his longtime sort-of friend Neill Jameson (of Krieg fame), Judd was also physically abusive with his ex-wife (said abuse being what cost him the marriage), would regularly try and get people to tag along with him to buy drugs in unbelievably sketchy parts of Chicago (and would throw temper tantrums if they told him to pound sand), and habitually fucked over bandmates and musician friends by selling rights that he did not even own, with his machinations regarding the Twilight supergroup costing him the very, very few friends that he had left.
Almost every single Greek Hero is one. Also every Greek God, varying between "Jerkass to some extent" and "Jerkass on steroids." (Athena is an example of the former, while Zeus is definitely the latter.) Considering the jobs of the Greek Heroes in Myth is to get completely screwed in the end (and they know it too) it is sort of understandable for them. Then you notice that the Greek Gods are doing most of the screwing on the Heroes and that most of the Heroes are children or grandchildren of the Gods, which only makes the Gods even worse Jerkasses.
Among the Greek Gods, the exceptions are arguably Hestia, Demeter, and Hades - and there are stipulations even there. Hestia hardly did anything in any myths, so her personality's a little flat, and Demeter did go into a sob-fest over not having her daughter Persephone by her side every waking hour of every day (case in point - it's when Persephone is with Hades that Autumn and Winter occur, never mind the mortals that suffer for her "grief"). Hades is generally considered a whole lot nicer that his siblings, but he can also be a Jerkassdepending on which story featuring him you read. (Did he take Persephone callously? Did she seduce him? Did Aphrodite have him struck by Cupid's arrow?) Hades was at least a lot more lawful that the rest, and despite a capacity for cruelty he was more sympathetic towards others (particularly compared to his brother Zeus).
Compared to Zeus and the others, Hades was downright saintly. He was willing to compromise and give fair deals, whereas the others would make a bet with you and then change the rules so they win, and punish those who dare to go against them.
There is an exception to the Greek heroes: Perseus. Possibly the only decent person in all of their mythology.
To be fair to the heroes, some of them like Hector, Cadmus or Hercules tended to be all-around nice guys. Some of their jerkiness is from Values Dissonance between ancient times and now or doing what they had to to survive in a harsh world. Many of their victims had it coming both then and now. Others like Jason and Achilles suffer from that, but are such big jerks that even back then they were regarded as complete assholes.
With regards to gods, though, Ares takes the cake. Granted, he was also relatively stupid and was the closest thing the Greek gods had to The Brute, but the fact that he was the god of unrestricted war...well. Athena, his equal and opposite, hated him. But then, so did everyone else.
In nearly any incarnation of the Greek gods in media whether it be comics, books, or television they will come across as this. Sometimes it will be toned down so they are more balanced or even likable, but they will somehow or another come across as jerks.
Interestingly, perhaps the noblest hero of Classical Mythology is Hector, greatest of the warriors of the Trojans. He actually opposed the Trojan War, only fought to protect his family and his people, treated his foes with honor, and actually treated his wife like a human being instead of a trophy (which was unheard of). He was even considered one of the Nine Worthies by medieval scholars, and it was said he was the first to wield Roland's legendary sword Durandal. Why is this interesting? Because he was neither a Greek nor the descendent of a god.
Encantados (Amazon were-dolphins) are Jerkasses of the first calibre. Their Handsome Lech behaviour includes using their powers to seduce girls and trick them into sleeping with them, knock them up and leave. Not only that, they lie to the women in question, promising marriage. They even kidnap girls and take them deep into the river, where the kidnapped girl will be a Sex Slave for the rest of her life (making them rapists as well).
The parents in Korean legends are usually that type, but those in the Korean legend "The Child General" take the cake. In the story, the couple who wished for a son for a long time (as they need one to carry on the family cult) finally gets one. He is predestined to be a lead general and as a child can already fly and do wonders. So, with this gift, the parents come to the conclusion that because of the danger that the child could become a rebel against the king (although the prophecy said he will be a general...) they kill the kid via asphyxiation with a pillow. Epic.
Strakk from BIONICLE. He's not good, nor is he evil, he just hangs out with the good guys because they don't really want to kill him. While he has honorable moments, like when he kept Malum from killing an unconscious Vastus, he's selfish, has a huge ego, only helps others for money, is not above belittling his teammates, nor taking the time during a fierce battle to start looting dead combatants. This behavior eventually escalated to the point where he himself attempted to kill a downed foe in the arena, which lead to the society banishing him to the desert.
Bitey, from the Brackenwood series of web cartoons by Adam Phillips, is practically the living embodiment of this trope. No matter how many times he gets beaten up, tossed, humiliated, or so on, he never shows any regret, and is always back to extreme Jerkass-hood in the next toon.
Bitey creates a lot of his own problems-in fact, the only time Bitey's ever been attacked without provocation was his encounter with the Yuyu.
Foamy the Squirrel, from the Neurotically Yours web cartoons. Even your garden variety Jerkass doesn't do things like encourage his owner to call back a stalker/serial rapist who keeps leaving psychotic messages on her answering machine.
When you think about it, every character is an asshole in Neurotically Yours to an extent. (Possible subversion in Pilz-E's case - his pills may make him this way)
Strong Bad of Homestar Runner. From making fun of Homestar, prank-calling Marzipan, kicking The Cheat to terrorizing Strong Sad, if he doesn't qualify as one, then who does?
Tinkerballa from The Guild. All she does is insult the other guild members, and openly admits that she only plays with them to swell her own ego.
There's an entire Space Marine Chapter dedicated to this trope, namely the Marines Malevolent, who are all a bunch of arrogant, prideful bastards that don't care for the lives of those weaker than themselves. This pretty much includes the entire Imperium they're supposed to be defending. Their callousness toward human life tends to piss off the more sympathetic Chapters, particularly the Salamanders after a nasty friendly fire incident.
Eidolon, of the Emperor's Children. He's probably the most arrogant member of a painfully arrogant Legion, is sycophantic to a fault, and regularly misreports his accomplishments or takes credit for his subordinates' successes to whitewash his own screw-ups. Note that all of this is before his Legion falls to Chaos. Eventually Fulgrim, Eidolon's Primarch, calls him out and cuts his damn head off...then later has Fabius Bile resurrect him because Fulgrim needs him for a ritual. Eidolon doesn't learn anything from the experience.
In the Magic: The Gathering fandom, this is how many, many people view blue decks (and many partially blue ones as well). Given that a large part of blue magic is built around counterspells ("yeah, that cool spell? No."), this was perhaps inevitable.
In Shadowrun we have Clockwork, a hobgoblin rigger and probably the most hate-filled, paranoid jackass on Jackpoint. At least his paranoia (the kind that isn't shared by every other Shadowrunner) is relatively contained to technomancers, but it still was enough to make him try to sell Net Cat (a technomancer and fellow Jackpoint user) to the megacorps when he knew they'd perform horrific experiments on her and was practically freaking out when he learnt she was pregnant. When he mentions the child's eye colour at one point, Net Cat, Slamm-0! (the child's father) and their friends are suitably disturbed.
Freddie, the American champion in the musical "Chess," certainly fits the bill. Throughout the plot, Freddie engineers offensive publicity stunts to get more money, constantly abuses Russia and his opponent, mocks/manipulates his second, generally acts like a whiny little child, and eventually breaks down after he loses the championship. Moreover, he's also violent and sensitive, making him easily provoked. Yet, oddly enough, he doubles as The Woobie, considering he sings a song called "Pity the Child."
Oh, Henry Higgins from Pygmalion! So very, very much! To wit: when he first meets the heroine Eliza he insults her accent even as she's trying to scrape enough money just to pay her rent; and he's endlessly patronizing and insulting to her when she comes to him for speech lessons. He makes no bones about the fact that other people annoy and bore him; and most of his interactions with other characters involve him insulting them, bullying them, challenging them, complaining about how bored with them he is, or else just bluntly identifying their accents. What's satisfying, though, is that the characters do notice this, and every single one of them Lampshades it when they remind him to have better manners.
Four words: Tom and Amanda Wingfield. The former is an Aloof Big Brother who, while shocked at the latter's own jerkassery, goes as far as to not pay the electric bill to get into the marines, and leaves her mother and mentally shaken sister for broke. The latter is the former's mother, talks about her past of having gentlemen callers constantly in front of her insecure daughter, and may have sent Tom into HIS aforementioned bouts of jerkassery.