This is going to be the last time I post in this thread, and I have a pretty good idea how much I'm going to regret posting at all, but here goes.
It's really simple: the idea that gender doesn't matter is the fundamental expression of male privilege. Not everyone is able to believe that gender doesn't matter, because the prevailing culture sometimes makes it matter--and that happens much ( much ) more often to women than to men.
If you're a man playing X-wing, it's really easy to believe that gender doesn't matter because you're never likely to feel unwelcome in an FLGS or other gaming space due to your gender. You won't be talked down to, you won't be stared at, you won't have your personal space violated or be otherwise physically intimidated, and you probably won't have to prove your knowledge of gaming specifically or geek culture in general in order to be admitted to the "club". I personally know at least one woman to which each of those things has happened, and I know a number of women to whom all of those things have happened.
And, as I mentioned upthread, Star Wars fandom has a reasonable breakdown between women and men (that is, one that's relatively close to the breakdown in the whole population). X-wing Minis doesn't have that: in two years, I've played against dozens of men in tournaments, but just one woman.
There may not be anything we can do about it. It may be that individual communities are too fractured for a broad approach to work, or that the wider cultural perception of gaming in general as a fraternity may be too influential, or possibly GamerGate is doing too good a job of portraying gamers as a group of men who are viciously opposed to the participation of women in their hobbies.
But I hope those things aren't true; I hope we're better than that. If your response to this thread is "STOP IT" or "gender isn't a thing" or "it's already balanced", that doesn't make you a bad person in any way--but it does make you an additional obstacle for half the population to overcome if they want to play this game we all really like.