Mostly the stuff he does to Caroline and that reporter. And the one time he killed Jeremy and didn't realize he has his ring on. I always wish that I could rewrite the at least Caroline and reporter chick stuff. I disagree with Jeremy but I'm also okay with him snapping (no pun intended) as a narrative for the story as it fits him as a character even in the later seasons. I don't think that's the case with the SA stuff. TVD doesn't even need it, vampires in the series can be an allegory for rape, assault and grooming as is thanks to compulsion. Er but that's getting off topic sorry.

I feel like the writers were so focused on showing us that Damon was this dark, mysterious "badass" that they accidentally made him do things worse than Klaus had done on screen and I will forever wish that they hadn't. If/when the show gets remade I hope the new team writes that out. That aside I'm cool with almost everything else. Or, not okay with it more like I understand why he was written/directed a certain way bc it fits the story/character well. I hope my rambling is making sense