Everyone does it, even a gentleman like myself, though I think it's a thing about personal image, you wouldn't just go up to someone and say "Hello I watch hershey kisses," or "Hello I like to masturbate," it just isn't done.

"If you see a person jumping down the street, you can tell his preferences by shooting at the guy. If he starts whining, he plays Counter-Strike. If he charges you wielding an axe, you just interrupted a Morrowind player buffing his Acrobatics."