Although I'm all for women to work in music, I think that this business just attracts more men than women and that's why there are se few. I don't think it has much to do with sexism.
I frequent several production oriented forums and I can't think of any female regulars to be completely honest with you. And I can't think of any reason for this other than women simply not really being into it (with internet anonymity and all).
Grumble. This is the same argument used to dismiss women in every field: "Oh, women just don't like video games." "Oh, women just don't like to code." "Oh, women just aren't that interested in ______."
It misses the point every single time.
First, looking at what you see and saying that's proof is flawed logic and just bad science. Second, what this dismissive nature does is a variety of things:
It ignores why, currently, there may be less (not zero, just less) women in one field. These reasons can range from systematic barriers throughout the entire process (women have long been pushed toward other careers and away from education in specific fields) to cultural shifts that have only recently begun.
It ignores why women who may be interested in a certain field feel pushed away once they reach a certain level. Certainly being constantly told they shouldn't be/aren't interested in something they are must be annoying. This boys-club mentality perpetuates itself top to bottom. (I have also heard from friends at a local studio that the mansplaining that occurs from teenage boys trying to get their shitty demo recorded and don't want to take any advice from a women is beyond compare.)
It ignores the women that are in this field, right now, and the unbelievable work they are doing. I would highly recommend checking out: Georgia Anne Muldrow, Dani Deahl, Sylvia Robinson, Linda Perry, and Trina Shoemaker.
Years ago the "women aren't interested in ____" argument could apply to almost any
field using this logic, even specific sports, entire industries, and the military. I find it as antiquated today as "women just aren't that interested in running a company" or "women just aren't that interested in chess" or any variation of the "women just aren't that into _____."
Here, we have an entire organization that stands directly opposed to your premise: women saying "we are
interested" -- to immediately dismiss that is telling.