Several characters are the slaves of other characters, with none of this being looked at oddly or negatively. In fact, the receiving of a girl's first slave is treated more like getting a new pet than anything else, with the mother telling the girls to "take care of them" and that it's a "big responsibility". However, in actual practice the situation often seems to be "slavery" in name only. Given the general treatment of women during that time period, being a slave to an Amazon was probably a reasonably sweet deal.
Since it is set in an all-female society, lesbian relationships are the norm (usually between mistress/slave) and sex with men is considered a necessary duty for reproduction. A woman actually wanting to have sex with a man is considered a sexual deviant.
Who has sex with his female slaves (or at least heavily hinted), slaves who are under magic to be unable to disobey his orders...
More recently the issue has been brought much more to the foreground of the story, when Eric refuses to release slaves who saved his life despite of being free of the mind control spell at the time, on the basis that they were just doing what good slaves are supposed to do in any case. It turns out later the real reason he wouldn't release them is that it was illegal to do so under Templar law. He eventually agrees to "sell them" to Trace, so Trace would take any heat for releasing them.
Gunnerkrigg Court: Stated in comic by one of the characters as being one of the (if not the) major reasons why the Court and the Woods do not currently get along.
Due to the vast differences between human and troll society in Homestuck, there's bound to be some in-universe dissonance. For example, when John tells Karkat that he's not a homosexual when Karkat hints at a possible future kismesis (a type of troll romance based on mutual hate), Karkat has no idea what the word 'homosexual' means. After John explains it, Karkat is shocked that humans even have a word for it, where as it's a complete non-issue for trolls, considering how they reproduce.
Later a different dissonance is Played for Drama when Vriska tells John that he, as a human, can't understand her justifications for killing Tavros.
Also played for drama earlier when Tavros contacts Jade and casually mentions that he once saved her life when she was a toddler and accidentally shot herself with a flintlock pistol by using his powers to make Becquerel redirect the bullet to kill "an intruder" instead. Said "intruder" being her grandfather. When Jade reacts in shock, Tavros doesn't understand why she is upset since trolls are not raised by adult guardians and in fact see most older trolls as enemies.
Most readers of Ralph Hayes, Jr.'s Goblin Hollow webcomic felt he hit this pretty badly when Penny's upbraiding an obnoxious, bigoted Jerk Ass preacher, something that was perceived as her Crowning Moment of Awesome and a fine example of her Character Development from being a Bratty Teenage Daughter to a Grumpy BearDeadpan Snarker with Mama Bear traits, was met in-universe by Lily demanding she apologize for causing such a scene in church and promptly slapping her in the face and grounding her for a week when she refused to do so. The author was deeply shocked, even outraged, when the readers were themselves outraged by this and revolted against Lily and Ben being treated as being the ones in the right.
Penny in general being regarded as a "troubled teen", as most of the things she actually does don't come off as being anywhere near that unusual or anarchic for a teenage girl in the eyes of most readers. Her biggest signs of "being troubled" are that she's surly, not too shy about sexual matters (though still a virgin) and always wears black clothes.
In the Thai webcomic Lily Love, Donut is concerned that she is ugly because she is supposedly dark-skinned. While this is normal in Thailand, where skin whitening is common, it would be considered odd in western societies, where tanned skin is seen as more desirable. Also in the comic, everyone is called by a nickname, which is normal in Thailand, but quite strange in other places.
An in-universe example occurs in Chaos Fighters, particularly in Lefrad, which consists of continents has different administration systems. Yedrei-Phlaq confrontation happened an unspecified time prior to the start of the entire main series, which is partly due to their leader trying to force their administration systems to others (Yedrei uses monarchy while Phlaq uses democracy. As the result, in Chaos Fighters-Route of Peaks, the government of Tziac sent only one person to join the main characters' party to eliminate the mountain bandits, fearing of bringing significant casualties to the soldiers, which happened during the confrontation. Even other countries merely used long range weaponry to eliminate them, despite sending slightly more (read: two) people to aid the main characters' party. This also leads to another dissonance where in Chaos Fighters-Route of Land, almost every country in Yedrei continent gave military support of various degree to help the Estau rebel pact, which is a military force to capture Lestreb from the demons' reign.
The mostly-defunct blog Gaijin Smash derives most of its comedy from the Values Dissonance that the writer (an American) experiences while living in Japan.
Noted by The Nostalgia Critic in "True Grit: Old vs. New", as he understands the original was made in the sixties, but he can't help but feel sorry for the snake getting its skull bashed in.
Brows Held High: Oancitizen's review of "Exterminating Angels" starts with him mentioning that the French are "famously blasé when discussing sex", then showing a clip from Amélie where Amélie is seen counting couples orgasming at the same time. He is perplexed that the film is rated "R" in the US, but only the equivalent of an "G" rating in France itself.
That Guy with the Glasses: Most of the reviewers on the site are American and are frequently discussing super hero movies in fullest detail. To people outside the US who are less endeared about super hero movies this can often come across as being very obsessive over something that is generally children's or in the very least early teenage entertainment. (For that matter, there are plenty of Americans who share that attitude, although they are understandably more inclined to keep their opinions to themselves.) Of course, in the U.S.A. most young people grow up with these types of comics and thus feel very attached to them.
It says a lot that the TGWTG reviewers literally ignored Steven Spielberg and Peter Jackson's The Adventures of Tintin movie, despite reviewing every other major Hollywood release. Tintin, which is an institute in Europe, is an international bestseller across the rest of the world as well, except in the U.S.A. where it remains a cult favorite. This might explain why the only TGWTG reviewer who actually discussed it was Film Brain, who is British!
The Cinema Snob focuses most of his reviews on offensive films, particularly porn and slasher films, but even he occasionally finds movies that are too far outside his values for him to take lightly. "Child Bride" and its themes of underage marriage were a struggle for him to watch, and while he could mostly joke about the Christian Fundamentalist anti-rock music flick "Rock: It's Your Decision," he angrily drew the line when the film's trump card proof of rock's evil was that some musicians were "admitted homosexuals."
Being from a more secular country, British viewers can get confused about the Lampshade Hanging of Santa Christ apparently being offensive.
Duckyworth, while reviewing Pokémon: Giratina and the Sky Warrior, had one of his complaints be upon Giratina's lack of appearance, appearing in only 5 of the first 43 minutes of the film, giving more focus to the 'annoying green flower rat' Shaymin instead for most of the film. In Japan, there is a bigger focus upon the more lighter, cuter aspects of a franchise, whereas in most of the merchandising, mainly cute Pokémon take up the spotlight, and the anime, while there is more of a focus of the more 'manlier' aspects in the western culture. Hence, the cuter legendaries tend to get a bigger focus in these films.
In Filmcow's Bino The Elephant, the idea of a character's wife having a "hat box" was played for Surreal Humor. Funny thing is, in the south, people do have hat boxes (even though Filmcow Studios is in Florida).
Since Who Back When reviews Doctor Who episodes going back to the 1960's, the subject of Values Dissonance can come up due to the casual racism and sexism of the time. Examples include use of Blackface in "The Crusades", or the fact that the "Celestial" in the name of the Celestial Toymaker was a slang term for Chinese in that period.
The Nigahiga video "How to Be Emo" makes jokes about people getting pleasure from hurting themselves in ways like self-harm (one scene has the emo characters in a knife-fight where they stab themselves instead of each other), and makes emos out to look like obsessive masochists who either have zero emotion or are exhibiting the Comical Overreacting trope. It was found hilarious at the time it was released in 2007, but has been scrutinized and criticized under new light in the coming years, which is why it has the most dislikes out of any of the old "How to be..." videos.
Watch Mojo's Top 10 Movie Tropes That Would Not Fly Today. Examples including casual attitudes towards rape, non-ironic racial stereotypes, and the blackface/yellowface.