Way to stereotype people. One of my friends listens to rap, and he doesn't dress, nor sounds like a jock. I listen to metal; 1. I don't skate and 2. I don't have long hair.
To the point of this thread: I believe some rap is bad influence, but most of the bad influence comes from media.
I was at an appointment, and I see this one kid sitting next to me. He has a toy gun, and he was pointing at some people in front of us. The thing was that he had the toy in his left hand, stuck out his left arm, put the gun sideways onto his left arms wrist. That's how the people in the movies do it, as if they were in a gang. The kid was only 5 years old - what the mother said when she was talking to the clerk.
Anyways, I wouldn't think the majority of the kids who listen to music, listen to screamo, emo, etc. because it's quite obvious; it's not music to them. So I wouldn't vote for screamo, emo. The ones who listen to that are mostly, if not always teenagers+.