MofuI never really understood separating men and women in competitive video games, it just undermines the women that actually succeed in this "boys club" that most competitive games are perceived as...
It's a common misconception that men and women are forcibly separated in video games. As far as I know, there are no rules at all in most competitive video games saying "the main league is for men only." It just so happens that the top level of esports is generally or totally populated by men. As a result, some women-only leagues are created, which do prevent men from playing in those leagues. But the main, top-level leagues, which are generally populated by men, do not disbar women from joining.
Without even getting into the biological differences between men and women (as in reaction time), some simple statistics can explain why there are fewer top-level women than men in most video games.
If we define "top-level" as within the top 1% of players for a population, then of course there will be more "top-level" men than women. This is because 1% of the male TF2 population greatly outnumbers 1% of the female TF2 population. All else equal, the difference in size of the male and female populations in TF2 will be reflected in the difference in size of the male and female populations in competitive TF2.
Why more men than women play TF2 is perhaps a question for another rahThread.