I'm a woman in STEM. I only went to a CC, so maybe there's a difference there, but I didn't experience much sexism in my time there.
I have experienced it at work, but usually from the younger, unsocialized men. Is it a problem? Sure, but I'll take that over my bosses being sexist.
Also, along with the sexism does come some privilege. When I do something wrong, I tend to get taken easier on when it comes to punishment. I also am able to form.... different (non-sexial) bonds with the higher ups. These dynamics are much different to any bonds I had with female bosses from my previous field of work, and they're different than the bonds the higher ups have with my male counterparts. I can say that I don’t worry about being laid off or fired.
However, I'm also fairly certain that I have a sharp awareness of these bonds and how to manipulate them to get what I want.
Not trying to poo-poo any sexism claims, just that there's also certainly a privilege to be had being a woman minority in a male-dominated field.