I understand you don't see why these things are problems. What is extraordinary to me is that you have confused "I don't see X" with "X does not exist". And then gone on to blather extensively based on this confusion.
I get it. You're a paragon of self control. Congrats. Have a cookie. But you're playing this game at the lowest difficulty setting: http://whatever.scalzi.com/2012/05/15/straight-white-male-th...
Other things become relevant when you play it on different settings.
> but if somebody is drunk, whether they're a guy or a girl - or whether the gender ratio at my workplace is 60:40 or 80:20 is irrelevant
Irrelevant to you, as a financially comfortable white man. It is not irrelevant to other people. You don't understand why, which is fine.
But ignorantly proclaiming on the topic is not fine. Aggressive dismissal of the concerns of other people is part of why large parts of humanity are underrepresented in tech.
You are part of the problem. Right here, right now. So ask yourself: what will you do differently next time?