Lots of stuff.
My weight, hairline, my glasses, my likes and dislikes, how I am so quiet, etc. Mostly it was what I was trying to do or what I was trying to get into. Like trying to better myself with exercise or learning new hobbies or instruments. I'd get nothing but snide remarks like "Why are you doing that? That's so stupid you're not going to be able to do that." Really does a number on your ability to stick with something.