Yes, just to look at the audience at a concert will prove your friends wrong. It's men and women, children and adults, from all walks of life.
God knows I've had people call me names because I am a Bon Jovi fan and proud of it. Especially in junior high and even high school. Well, maybe I deserved some of the tease, considering what Taija and I did sometimes...

I never took too much stress about it tho, I just thought that let them talk - they don't know what they're talking about anyways. Now, after 10+ years, I guess I've earned the respect of most people, they noticed that I was serious about BJ. Take my parents for example - nowadays they don't question the thing anymore, they just take the whole thing as part of my character and life. They don't even compain about the tour, they are just very encouraging!

My dad even goes around telling people in the pub and at work about our trip, and he can remember every single concert we're going to!
I guess what I'm trying to say is you shouldn't pay too much attention to what other people are saying. Just hold your head up high and wear those BJ t-shirts with pride. If they can't understand that BJ is a big part of your life, then it's their loss.