I haven't gotten any myself just a few silly questions here and there. But I heard my MTF friend has trouble sometimes. I think it's mostly verbal though, but it still scares me, for her sake. She's got it pretty hard as it is and she doesn't need some ignorant jerk making it worse.
This isn't in school, but my cousin calls me a "she-he" and he does dumb stuff like that. But he's horribly immature and it's easy enough to ignore him or call him girl names all day until he shuts up, (I've tried reasoning, and it doesn't work). That's the worst I've gotten though. I'm sure there are people at school who talk about me but frankly I couldn't care less.