@hawkeye10,
Sometimes women also need to be by ourselves without menfolk around, and this sort of adolescent "who's-got-the-biggest-dick" silliness is one good reason why.
Also, for your information, ignoring a direct challenge is not natural to either sex. Women often enjoy a good fight, haven't you noticed that right here on A2K? (Where are Chai and Shewolf when I need them!)
But mature adults (of both sexes) don't feel the need to dignify some things with an answer. The most successful and respected men I know are masters of knowing when to speak and when to shut up. It's a real talent.