According to Fan Dumb, Sakura is stupid for not leaving her "love rival" Hinata to die. LOLWAT.note Most people, Fan Dumb or not, tend to forget that even if Hinata did die, Pain would've revived her alongside the rest of the village, anyway.
An even more extreme case is Karin, Sasuke's team mate, who gets bashed from both SasuSaku andSasuNaru fans, although the former are more virulent about it. Fans often make Karin into an oversexed nympho with constantly opened legs (when she's almost the exact opposite) who tries so hard to "steal Sasuke from his rightful lover Sakura and/or Naruto", especially if the fic's setting is High School. True, Karin's infatuation with Sasuke wasunhealthy and obsessive — she did plan to drug his teammates and rape him. But the shippers' attitude towards her still carries a whiff of this trope, since they ignore that most of her antics are Played for Laughs and as more of a character flaw than a marker of being "a bad person", that Sasuke knew about all this when he recruited her for his team, and that beyond this she does genuinely care for him.
All of which is ultimately rendered moot by later events in canon, like Sasuke crossing the Moral Event Horizon by trying to kill Karin and Karin being saved only by Sakura's intervention - which is followed by Sasuke stabbing her In the Back. There's probably something to be learned from all this.
There's a fair amount regarding the Ino/Shikamaru/Temari triangle. Shika/Tema fans often turn Ino into a shallow and shrill bimbo who only thinks of her looks and is way too stupid for Shikamaru. Shika/Ino fans often bash Temari by making her a domineering and cruel Yandere-bitch who stops at nothing to make Shikamaru hers. Things got worse when another girl named Shiho took a romantic interest in Shikamaru, becoming the triangle's Third Option Love Interest; both Shikamaru/Temari and Shikamaru/Ino fans want her to die in a fire.
Hinata Hyuga is bashed a lot for liking Naruto or (according to some fans) her cousin Neji. There are several fics where Hinata finds out that Naruto has the Kyuubi trapped inside him and proceeds to hate or fear him, only to be slapped into shape by Sakura. (The idea was Jossed in Ch. 355-356, when she doesn't react when it's mentioned around her). There's also the hate she receives for her characterization as a Shrinking Violet with such fans saying that "she's too weak and shy and doesn't deserve Naruto". Naruto/Hinata and Naruto/Sakura pairing wars get ugly; it's always assumed that Naruto/Hinata fans bash Sakura (a majority of them don't), and Naruto/Sakura fans bash Hinata (again, a majority of them don't).
Has become specially ugly since Naruto saved Hinata's life in the middle of the Shinobi War and has aknowledged her as a strong person. The Sasuke/Naruto shippers on several places (specially tumblr) have gone berserk at that, pouring tons o shit on poor Hinata and the Naru/Hina shippers.
Chapter 615 has brought out even worse from the Naru Saku shippers after the interaction between Hinata and Naruto in said chapter.
The Naruhina fans have, at times, even taken to use things that the Narusakus throw at them as good things, such as making her stalker with a crush tendencies and making it cute or a sign of love. Though even they do point out it can be considered creepy.
Even if the "stalker with a crush" argument comes strictly from the exaggerations the anime makes with characters.
Naru/Saku shippers prefer to attack Sakura's mother! She's had about two lines in the anime and has made no appearance in the manga, but Naru/Saku shippers unleash the fury of Hell upon her.
Shino is badly treated in the few fics about Kiba/Hinata. This is odd because Shino seems to have no romantic designs on Hinata at all.
It's bad enough that so many characters are treated to Die for Our Ship in favor of the virtually asexual and very troubled Sasuke, but the equally virtually asexual Shino is treated to this for a ship on a much more minor scale… seriously. If there was something called shipping dissonance, the Naruto fandom would have it covered.
Many yaoi fangirls tend to to pair Kiba with Hinata at first only for him to realise in the end that she is a manipulative bitch and have him fall in love with Shino or another male character in the end.
Kiba often gets characterized as easily jealous and overprotective of Hinata.
Kiba may just be the most bashed male in the series after Sasuke
Fics that pair Hinata with someone other than Naruto tend to have to explain at some point why she is not pursuing or with him. Some may indicate that Hinata decided that she wasn't actually in love with Naruto, but others kill Naruto off or have him reject her in favor of Sakura without any regard for her feelings.
Neji is sometimes treated poorly in fanfics that pair Hinata with someone else (especially if that someone else isn't Naruto), and he is sometimes portrayed as hating Hinata even after his Heel Face Turn. Oddly, Neji rarely suffers in Tenten/Lee ships.
Neji may be the personification of this trope after he dies protecting Naruto and Hinata.
Even minor characters get it. Matsuri appeared as one of two Gaara fangirls in the manga. In a Filler arc of the anime, she had the misfortune of being introduced as the only one willing to accept Gaara as her teacher during a training session. Raging fangirls hate her guts because of the possible Hot for Student-like Ship Tease moments she had with Gaara, something NO other girl on the show ever had. This page shows just how far Fan Dumb can go...
Then there are the Unfortunate Implications that these Gaara "fans" want the only person (besides his siblings, Naruto, and maybe his mentor) that would give him a chance to die. Apparently, they want Gaara to have more reasons to morbidly depressed, lonely, and suicidal. Let the guy have a companion, people. He really needs it.
Sai not only gets criticism from Shika/Ino shippers, but also gets lots of flak from Naru/Hina shippers for telling Sakura how much Naruto loves her, even though it's shown later that he's no Shipper on Deck, in fact suggesting that Naruto's promise to bring back Sasuke for Sakura's sake is causing him no small amount of pain. This is partly because Sakura initially assumes that if she offers Naruto her love (sincerely or falsely), he will give up on Sasuke, although this quickly fails and is most likely was not what Sai had in mind.
It doesn't help that he was emotionally repressed and he feel into total stoic mode because the only person he cared for like a brother died. He reads books on relationships and love because he can't understand it by himself. In the real world, he would have to undergo intense therapy (actually a lot of characters need to). Then there are the fan fics that depict him reading porn that makes him decide to capture a female cast member and try it out on top of the fact he doesn't know sexual assault is wrong, effectively calling him an ignorant rapist. This is despite the fact that he must already know what sex is because we see him insult Naruto by stating that his "package" must be small. That just indicates that he probably knows what "packages" are for and why it is an insult in the first place.
Asuma, who along with Kurenai was part of a rare official couple in Naruto, gets treated poorly in some fics that pair that her with Kakashi or someone else.
Sasuke gets this sometimes, too, which is only natural given what a Base Breaker he is - it's not too hard to find people that don't want him anywhere near their preferred girl/couple. This is mostly Naru/Saku shippers - which gives them an opportunity to have Sakura realise how much better Naruto would be as a partner (at least when they don't exaggerate it) - but some others who are protective of their favourite characters take extra care Sasuke won't dare interfere. Fact is, though, in Fan Fiction it's actually not that hard to take Sasuke's negative traits Up to Eleven with a little work, making him a villain handily enough without making him unrecognisable... that is, if they don't just kill him outright (seriously, some writers have even written Wave-AU-Fics where Sasuke is killed by Haku, an incident he survived in canon).
It's true. He gets turned into a far more horrid individual in so many fanfictions its rare to find one where he isn't a complete monster.
Rin, the Combat Medic in training that was in a Power Trio with Kakashi and Obito in the past, got quite a bit of snorts and bashing from fans because of the Love Triangle: Obito liked her, Rin liked Kakashi instead, and Kakashi felt that he couldn't return her feelings after Obito's death. The heat, however, has started to take quite a bit of misogyny-based force after a recent chapter revealed that Obito grew into the very shady and evil Tobi from the Akatsuki, which the Fan Dumb intepreted as her being at fault for Obito's Face Heel Turn and then "translated" into "Fucking bitch, she didn't give Obito vagina, now he's evil. IT'S HER FAULT"
Which will probably be squashed out soon due to the fact that it isn't because she refused a romantic relationship with Obito that caused him to become Tobi (in fact, she wasn't even aware he had feelings for her until after his "death"), it's because she died.
It Gets Worse: Chapter 604 reveals an event that certainly explains why Obito is evil: Kakashi "supposedly" killed Rin, via arm through the chest. Who knows how the Fan Dumb will react to that.
Though this comes at the end of the Chapter, meaning that most reactions will probably be too premature. It's likely that there's a twist, such at least one of the two was being impersonated, or that Rin meant for this to happen, or Heck, if Obito could survive, why not Rin? She's a medical ninja, and she could certainly heal herself. Knowing this series, Rin will make an appearance in the present day... somehow because if she's truly dead, Kabuto was resurrecting EVERYBODY else's friends and families, even pulling out Sai's brother. So why not Rin? It would certainly mess with Kakashi, but it would certainly mean that Kabuto could figure out Obito is Tobi for two reasons: either Obito puts Rin's body off limits, or Obito insisted that she not battle because he doesn't want to lose her again (which is unlikely because Obito is still going on with his plan.) Kabuto still didn't know that Obito was Tobi, only that he wasn't the real Madara.
Even then, it's highly doubtful that Kabuto could procure her DNA via her remains, and to be truthful Kabuto's only been resurrecting famous ninja. It's highly doubtful that Rin is really that famous.
Ninja were specifically after her (or her corpse) for some reason. She's notable enough for something.