Patriarchy tells us that women, by nature, are weak and passive. Thus, when women demonstrate strength and competence, patriarchy has a ready-made answer.
Via shakesville, via Rick Reilly at ESPN, sportswriter David Whitley has summed up patriarchy's answer to women who are good at the things that men do:
"Rule No. 1 in determining whether an activity is a sport: If the best female in the world can beat the best male in the world, it doesn't qualify."
He was being serious.
In Whitley's world, the definition of sport is not a fixed category. Sports is gendered as male, and its nature is capable of changing whenever a woman beats the "best man" at a particular activity. In this way, by definition, no woman can ever be "the best" at a sport, no matter the activity or skill required to participate in it. If she is better than a man at something, it is an "activity," never a sport.
Here, in addition to a comical display of incredibly insecure masculinity, the arbitrary and farcical nature of "male" and "female" in a patriarchal system is revealed. Do you see how quickly and easily male can be redefined if a female demonstrates that she can do male better than the "best male"?