DarkReign,
I have two main points here:
1. Music for suburban, rebel-wannabee teenagers hasn't changed that much. I picked on metal and picked Twisted Sister as an example, because lots of really stupid metal has been aimed at kids over the years. Twisted Sister, Poison, Megadeth, and Motley Crue were all popular artists during arguably metal's most popular era. Of course not all metal sucks like that -- that's my point: not all hip hop sucks either.
Suburban teenagers who think drivebys are way cool and daydream about being pimp lords of the ghetto aren't really all that different from suburban teenagers who think Ozzy biting the head off a live bat* was way cool and daydream about being black lords of evil.
And really, teenage rebel music wasn't all that different when it was Link Wray, Hendrix, The Clash, Marley, the Dead Kennedies, or Nirvana -- the main difference is that the music didn't suck.
Fortunately, past generations have proven that teenagers do grow up.
(* I have no idea whether this is a true story or not. It doesn't matter. The point is that a lot of teenagers believe it and think it's cool.)