Many but
1) When they really emphasize mc is plain but ml falls for them, and other "hot" people also fall for them , they say it's because of personality but they are not different from everyday people.
2) when mc keeps refusing physical contact even after they are in relationship and ml keeps forcing himself in mc and be like "I know you like it"
3) falls in love with mc and starts sabotizing all relationships around mc cause they are jealous. Tries to ruin plans with other "male" friends
4)mc taking ml feelingz for granted and just settle with him at the end of story (it doesn't even feel like they have feelings)
5) stalking them every where
6) meddling into their affairs to "help" without asking for their consent
(I read something like this recently so...)

I need you guys to comment to this!
What's your "don't like" in your reads?
Mine is when there's SA involve like it was normalize? so disturbing.
When they literally raise the person who suddenly became their ROMANTIC INTEREST when they grew up.
When there's too much romance in an action/fantasy (but there's exceptions where the fl is actually likeable or barely romance shown).
Doubled/Missing/unreadable Chapters.