I thought of another one...
I hate 'tsundere' type characters... I understand the appeal, but I just find the excessive violence the often bring to the table very offputing. (this is offcourse ignorable in slapstick comedy)
For those that don't know, tsundere is when a person (usually a girl) is very harsh, often physically attacking or psychologically manipulating her would be partner just for the sake of expressing her feelings, usualy due to embarassement, or anger, but can be tied to other reasons.
I don't mind it if the character has a sensible amount of sass, like being uncooperative or pouty just to call atention, or not being able to fully admit ones feelings because of social awkwardness or a refusal to get 'over the line'... Those are endearing traits that (when not detracting from the plot) are endearing and cute.
Normally i dislike when characters in romance get physical at all without some damn good emotiona reason. But straight up smashing some poor dude because of an accidental thing is a very shitty thing to me, and normalizes some things i'm not cool with... Specially when they are not held accountable for it at all and the guys is just supposed to 'put up with it'.
The way i'd fix it is kind of clear above, like make it into a character trait as opposed to a trope, they must have a reason to act like that in the first place. And have that reason be confronted.
Like... If she does so because she saw her mother doing it to her father, maybe there is a certain degree of psychological scarring there... if she does it due to social pressure, having a moment where she goes out of line and realizes the pain she put their mate through is a great thing.
And better yet... Don't have the target character take it everytime, have him talk back at some point, get angry or just flat out leave her because of how sour she is making the relationship... And most importantly, after they make up and move on, don't make it so it just perpetuates, show her trying to be better and him calling her out on it.
That would feel healthier and more fun to me at least.
Also, sorry for using 'her' all the time, i just did it because even though this is a bad estimative, but 90% of 'tsunderes' in media are female... Mostly because these same behaviours are not considered as forgivable on a male character.
Because... Double standards.