They be dumb :P
In all actuality, Justin Bieber and Lady Gaga have their own set audience, same with One Direction.
Bieber fans are 12 year old girls
Lady Gaga fans are more diverse in ages, but generally, I'd say they're a bit coo-coo
One Direction fans are girls that want the world to burn... :P
I'm not a huge fan of any of those music groups. Same with Adele, for some reason I just don't like most of her music :P