While I agree that it's not good to be too 'odd or different' at a very young an age, I think its great that teenagers can express themselves. Not good sense to get tats on the face or anything of course, but anything else can be taken out/hidden for jobs and stuff calmed down.
I was a total art school cliche, had a mohican haircut, the make-up, the clothes. Just toned it down for job interviews etc and never had a problem, got every job I ever went to, but then there were more jobs around then I guess. My father at the time was a little wary at the beginning, but my mother was excellent, she knew that it was good to be yourself and also knew that it wouldn't last forever.
Strangers judged me and my peers for our clothes and looks, but I can tell you it was incredible short-sighted, my friends were the kindest of souls you could ever hope to meet and are now highly successful people (doctors, teachers). I never saw any troubles with folk dressed like that, no fighting, no stupid behaviour. However, I saw a lot of that rubbish with my fellow t-shirt, trainers and short back and sides age group.
You lot just sound like a right bunch of old fuddy-duddys. It's good to be different, to stand out in a crowd if the kid want's to do that. It can teach so much, and I, well it gave me confidence and it taught me that judging folk on looks alone is stupid and those folk miss out on what can be an incredible person, mad style and all.