In the past, teenagers have gone through a lot of fads. From the "flappers" of the 1920's, zoot suits, white bucks, hippies, grunge and on and on up to the emo thing. At a time in their lives that they're breaking out on their own as individuals, so many young people seem to try to imitate each other.
How everybody dresses and acts is their choice but for me, I'm not into imitations. We're all individuals so why try to look like you came off an assembly line?
Think your own thoughts and walk your own walk.