Nothing, I guess. I just get goofed on for being a fan. Kinda the same way I would goof on someone for being a Hootie and the Blowfish fan...
My wife was goofing on me the other day as I was teaching myself some Bryan Adams songs to sing/play guitar. Then the next day I was singing and playing Heaven and she said she really liked that song. She didn't know it was a Bryan Adams song. Then I goofed on her for being a fan and not knowing it...