Why do people hate emos?

A LOT of people think I'm emo. I have naturally super dark hair and have some bangs (doesn't everyone?). But because that, and because I wear some black, a lot of people call me emo and make fun of me. I'm getting a little tired of it, especially because i'm going to a new school this year. I just want to know WHY people hate them so much. I personally don't mind them at all, in fact some of the nicest people I've known. I don't dislike preps, my best friend is a prep, so yeah, just a little confused (: thank you mucho!!