I think it's hilarious that so many people I know think that it's funny and comment worthy when I wear one of my superhero shirts, or have something on me that shows that I'm a fan of some sci-fi, comic or whatever geeky thing I'm enjoying at the moment.
However, if I were wearing a football jersey, had my face painted and sat screaming at a group of college kids for several hours every week, no one would bat an eye.
This world is weird.
We're all geeks about something. Embrace it!