Damn, you mean the sub-culture of look-like emo's. Yeah, back in the day, "emo" wasn't actually a group of people, and they didn't just decide to go die their hair black and whatnot. They had problems, and made self-inflicting injuries. Now-a-days, people think those people were cool and want to be like them, but lets die out hair blacks on top of that!
Edit Edit: Poor anology. A better one would be a kid dressing up as a doctor for Halloween. It still doesn't make him a doctor.
Yes he can dress up as a doctor and it wont change anything, but if they find that culture appealing, if they like the clothes, the music and the people,and want to be part of that culture they can, unlike a doctor you dont need requirements, if you feel that culture suits you, then thats the catagory you fall into, you dont have to do something like cutting yourself to be emo. If they happen to like the emo culture, and want to be part of it, they can, you cant say "your not emo" because they dont self harm.