Strange, the bigger LAN parties I went to (when I was young, oh, those were the days) let girls in for free, and men had to pay.
Cue feminist indignant comments in 3... 2... 1...
or not?
Depends on if the women in question are expected to make some "other" sort of payment once they're there.
Like, you know, how women can often get free drinks in bars. If they've taken their shirts off.
And yes, if women are going in and no one is ogling them (i.e. they got in free because they're effectively working as pinup girls) or treating them like trash and they're actually allowed to participate as equal members, then
that is wrong.
As far as the women being banned from gaming thing, if they were insulting the men in a way they couldn't handle (what would they say? Accuse the men of being too violent? That's the most prevalent male stereotype over here, and I have no idea how that would possibly come off as a negative in context), there is absolutely no reason why the founders couldn't have put a restriction on hate speech.
Because theoretically, it's an equal problem, affecting both genders equally. And, if that is the case, in those situations we should see women and men banned in 50-50 proportions.
Of course, that isn't what happens.
Perhaps I'm somewhat biased from my experiences of playing video games with guys, in which I have found overwhelmingly that either
a. they gave me crappier equipment than anyone else and always stuck me in the last slot; if I decided on something they wanted, they were going to get it
b. they didn't want to play with me because they thought I couldn't handle the trash-talking.