Alright, I think you guys have listed almost everything that bothers me.
Hmm... I suppose I can come up with one or two:
When something horrible a female does is excused because she's female, but if she were a guy, everyone would be screaming "abuser."
When the LI has a girlfriend/boyfriend yet continues to flirt with the MC and there are no consequences for this whatsoever—in fact, it's a good thing because the girlfriend/boyfriend is a straw!asshole. I never forgave McDreamy for that.
Ugh, yes. TV shows are particularly bad at this. I've seen guys getting beaten up by their tiny wives played for comedy. Like, I don't care how small she is, getting slapped across the face, hit with frying pans or pushed into things can still freaking hurt.
Also, since this thread is very dude-centric (though unfortunately they are the major offenders in YA at the moment), I'll add some girly ones.
The girl who acts like she has a right to be with a specific boy. This is an especially funny one because it's just as common in "heroes" (well, MCs) and villains. You have the villain saying, "hands off, bitch, that's MY BOYFRIEND" and, perhaps even worse (because, you know, the girlfriend does have a right to be somewhat pissed), the MC who becomes convinced that she and Specific Boy belong together. Common traits- assuming it's what the guy wants and demonising his current girlfriend (three cheers for the "slutty cheerleader"!)
It just presents the guys as so stupid and, to me, is the male equivalent of the LI who disregards the FMC's wishes. They just assume that, because this guy is so perfect, he can't
possibly want her, he must want
me instead.
I especially hate the double standard of the girl who despises her love rival and refers to her as the slut, the whore, the one the guys only want because she shows herself off or everybody knows she's easy. Not only is this a terrible, slut-shaming thing to do, but if you really hate that kind of girl so much, how can your LI be so special if he's into that? Oh, right, because boys are blind idiots who are led around exclusively by their dicks, and it's up to you to show him what real love is. If you can be so sanctimonious and demeaning of a girl he seems to like, you don't deserve him.
Breaking a couple up so you can be together. No way does that work.
The guy with the girlfriend who is perpetually mean to the MC by the guy is too stupid to see it.
The guy who slept around with all the girls before he met you, and now he only wants you. There's nothing inherently wrong with wanting to slow down on promiscuity for a longer relationship, but I think it too often creates a dichotomy where the female characters who did sleep with the LI are considered to be stupid, whores or at least "not good enough" where the MC is considered great because she's pure.
Okay, this last one might be a little contentious but - stringing two guys along. The phrasing is frequently associated with the kind of guys who believe the "friend zone" is a thing and Nice Guy syndrome. But I must admit that when a girl is constantly swinging between two very attractive guys (who mostly seem content to just wait around for her to make up her goddamn mind), I just roll my eyes. Especially if she changes her mind several times (if you're writing a series).