If it bothers you that much, tell them they are just ignorant sheep and carry on with what you enjoy best. If it doesn't bother you as much as you're letting off, just let them be ignorant.
There is always going to be people out there that learn about a stereotype, and go around thinking it's the only way you can view someone/something.
As for the guy on the radio, just laugh at him. Whenever there is some one that goes around spouting "I'm a man, I like women and sports and I'M A MAN DAMNIT!" It usually means that deep down they are either,
1) Extremely insecure with themselves to the point where they feel the need to act out in this manner.
2) Have not evolved passed primal thinking. This is when a person falls back on the basic principals that they are an alpha male in a pack of wolves. This means they are just simply not intelligent enough to realize that there is no real need for this kind of behavior in todays society.
3) Since you said this guy only starts acting this way when it comes to video games, he's probably hiding a deep dark secret that he himself is a gamer as well, and for whatever reason is afraid of acknowledging this in the eyes of the public.
Trust me, there's a lot more to this behavior than what meets the eye, for no one acts this way JUST to be a dick... It goes a LOT deeper than that.