Stereotypes!?

I feel you, for some reason some people tend to think you have to fall into a certain category. I'm with you, I'm pretty preppy myself, so when I throw on a band T-shirt every now and again I have to hear about it from everyone. People have different styles, tastes in music, etc. And by the way, she probably just said that to you because she wishes she could express some of the things she likes, but doesn't think her friends will approve.