Content warning misuse really gets my goat. Your sales, common sense, and other dumb shit has no place there. Warn for content. It's in the name of the damn feature.
Said warnings not having a toggle. I don't get bothered by much, and none of what bothers me is character based, so the entire system even when used right is annoying to me.
Bumps not having a toggle for notifications cause I try to remember to not bump, but sometimes you have to, and then sometimes I forget about the notification and bump and feel bad when I remember.
Tabs showing up in the IC picker with no way to determine what shows up there.