I hate when people assume because I'm shy and smart that they can push me around and cheat off me. I also hate when a ceratin person says things like "Hey, Asian, how was your lunch? Whose dog did you eat this time?" and how some people make random "asian" noises like ching chang, blah blah blah when around me to tick me off.
I hate the redneck assumptions (though sometimes it is true with kids...)
Northeners are all nerds
people who like black are emo
I hate sterotypes in general.
Luckily, most sterotypes aren't used in my school, though there can be some assumptuous people at times -_-*