Gaming is rising in popularity right and isn't a nerd underground hobby anymore. People of all walks of life play it now and there are all kind of games to all kind of pockets.
So, at this point, I don't feel like I need to prove people gaming is cool. If they want, cool, if they don't, it's cool too.
Gaming isn't a religion and if someone don't like it, I don't make an effort to "convert" him. If anything, I found people who dislike games end up enjoying what they call "casual" games which is like trying to convert an atheist just to see he end up on a different religion.