Female players are worse, but NOT because of their "female genetics". I think its purely a matter of female players using less time playing videogames, and or lack of willingness to test themselves against better opponents to test themselves. A bit like i football, if you want to be the best, you dont stay in the danish league, you move to UK or spain or even just Holland (no offense!). Then you play against slighty better opponents and move up.
But if you keep playing in the "danish" league, you will think what you do is the best because you are winning, thus not looking for improvements.