Everyone Has Standards

Whether someone is a villain, geek, jerk, pervert, etc. -- one often finds those things that can only go so far. These characters find that when they're in a situation where they would cross a certain line, they don't do it. Or they get disgusted at those who do cross that line.

A Super-Trope to Even Evil Has Standards, Even Nerds Have Standards.

Examples of Everyone Has Standards include:

Anime and Manga

In Magi Labyrinth of Magic, Ka Kyoubun attempt to make King Sinbad married Princess Kyougoku, his superior, by making it look like King Sinbad had violated Princess Kyougoku is failed because of his henchmen, which he promises promotion, can't stand Princess Kyougoku crying.
In Naruto, anyone who has ever met and spoken to Uchiha Madara pretty much hates his guts, barring his brother Izuna and his former best friend Hashirama. Not even Kurama can stand him, and considering the shit he's probably had to put up with over the last few centuries, that says a lot. The people that can stand him? Izuna's dead, and Hashirama became his mortal enemy the moment Madara decided to attack Konoha, the village they built together. It gets to the point that even his long-time accomplice Tobi/Obito Uchiha reveals he doesn't care for him all that much either.

Comic Books

Despite his wife, Wanda, marrying Terry Fitzgerald and welcoming a daughter, Cyan, Albert Francis "Al" Simmons a.k.a Spawn opts to leave her alone as he notices she had move on.

Live Action TV

In Will and Grace, Lionel thinks Karen is a hooker when he first meets her:

Lionel: You don't have sex for money?
Karen: No, I do not! For jewels, for furs, for mixed securities, like a lady! But for money? How dare you!

Charlie from Two and A Half Men is a Casanova, but on one occasion, he almost slept with a woman who may be his half-sister. They didn't know then, and their mothers told them barely on time. Charlie's reaction was to say he draws the line at incest, but his possible half-sister's reaction...she was willing to continue.
In Dexter, complete Jerkass Quinn shows up at a party thrown by his ex-girlfriend, Deborah, and he has some anonymous slutty girl with him. He acts drunk and stupid enough to annoy everyone at the party, but the slutty girl doesn't mind, until she finds out that she's only there to make Deborah jealous.
The Mystery Science Theater 3000 crew watched but refused to riff on Child Bride as it was worse than Manos and the subject matter disgusted even them.

Newspaper Comics

Even the Internet has standards as this Garfield comic strip.
- like most cats, Garfield likes to hunt birds, but he was upset with Jon's family turning Nadie the chicken into soup. He considers pets as family.
Calvin and Hobbes: While the titular characters are quite self-centered, they draw the line about making jokes about those who are starving.

Web Original

90s Kid of Atop the Fourth Wall loves extreme things, but killing pregnant women is not extreme to him. Thus a scene in a comic where that happened got him depressed, and it took a Rob Liefeld comic to get him better.
SF Debris was noting a particularly sexist scene in a Star Trek the Original Series episode, and said he was offended, even though he thinks porn should be on the food pyramid.
One of the tentacle monsters in Ghastlys Ghastly Comic thinks it's wrong to sexually assault human women.
When The Nostalgia Critic tried to review Sesame Street: Follow That Bird, but no matter how silly or dumb the movie was, Critic couldn't make himself do it.
In Bum Reviews, Chester notes that even a bum wouldn't forget to put on a coat while hiking in the mountains, unlike Bella from Twilight.
In The Dolan True Stories episode, OUR WEIRDEST PERSONAL SECRETS, Nixxiom, Lord of Darkness, explains how disturbing fan fictions were normal by his standards. One such fan-fiction involved Decapitation and have 'somethings actions' with the body.

Western Animation

While Glen Quagmire of Family Guy does a lot of perverted things, there are some lines he won't cross, like sleeping with Meg when she's desperate for affection.
- Though in a more recent episode, she turned 18 (and thus became legal), at which point Quagmire immediately and shamelessly starts seducing her, and almost sleeps with her, before Peter and Lois stop it in time.
In Phineas and Ferb, Perry the Platypus had thwarted many of Dr. Doofenshmirtz's Evil Plans, no matter how silly they would get. But when his scheme was learning whale speak, just so he could insult a whale for stealing his girlfriend, Perry left in disgust.
Beavis and Butthead
- Even the title characters have standards, Butthead can’t stand male nudity, especially if Beavis is naked.
- David Van Driessen maybe a hippie, but you’re asking for trouble if he finds out about “inappropriate” touching.
- Buzzcut may dish out abuse on the boys but it's okay if he’s is THE ONE dishing it out, anyone else… GAME OVER.
Throughout the series of Ed, Edd 'n' Eddy, the kids of the cul-de-sac often had their issues with the title characters but they lived in fear of Eddy’s brother. At the film, when it was revealed that Eddy’s brother is abusive toward Eddy; the children including the Kanker Sisters were all disturbed at it.
In the South Park episode "With Apologies to Jesse Jackson", a group of Rednecks wanted to kill Randy for using the “N” word on national television.
- In "Eat, Pray, Queef", the male characters of the town are disgusted by women queefing. Yes, even Cartman is left horrified after Butters gets queefed on and tells off a lady to stop queefing.
- Granted he's a Depraved Bisexual, but Mr. Garrison won't engage in pedophilia.
In King of the Hill, even Conspiracy Theory-minded Dale has his limits. He's known to exhibit Papa Wolf traits Joseph, despite actually being his step-father, when Piggy is allowed to use paddling as a form of discipline. He also thinks Hank was going crazy for losing his faith in George W. Bush. Despite Nancy cheating on him with John Redcorn (resulting in Joseph), Dale won't cheat on her.
- Despite being emotionally harsh when it comes to his parenting, even Hank doesn't like the idea of spanking kids. Instead, he rather give Bobby extra hard chores, like yard work, as a punishment as he considers it harsh enough. Of course, the exception being mowing the lawn, as he considers it a privilege.
In Hey Arnold, a sign of someone really realization they screwed up is when even Arnold loses faith in them.
Arthur has Blinky showing his limits when it comes to bullying. If his victim shows signs of hurt or sadness, that's where Blinky stops. This was shown in "The Last Tough Customer" after Molly makes fun of George for his dyslexia, to the point of tears.
The title character of Archer draws the line when it comes to underage women despite being a womanizer.