Go on Steam, look at the most played games right now, look at the demographics for those games.

Or pick some player profiles at random, count how many girls vs guys you find (very easy to tell with high accuracy just by looking at the games they play, yes there are exceptions but they're actually quite rare, I promise you can get >90% accuracy after you do a few).

Steam user base is at least 3/4 male by user count, probably even more by play time.

Which part? Are you actually claiming that in your experience steam gamers are mostly black, mostly gay, mostly women, or what? Because that would be a shocking statistic we'd probably know about given the general population demographics of race/orientation, and general interaction with the female sex in real life.