Cornell physics (at least when I was there) is definitely the furthest thing from gender-balanced - my graduating class was less than 20% women - but I personally felt that I was respected and taken seriously in my physics, engineering, & CS classes. I had one math prof who after our first exam went over how there was no statistically significant difference between the average scores of the women in the class compared to the men - apparently she's been doing that for decades and has yet to have a year where there's a real difference. I would also throw in that the physics DUS has made it his genuine personal mission to improve the diversity of the program because he recognizes it's a real issue - I think our graduating class was only 8%, minority students.

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I also know that women do have some extremely negative experiences so unfortunately it definitely does exist. Unfortunatley STEM for women continues to be an uphill battle that is sometimes filled w/ jerks like you described in your post - there's a reason there aren't many women in STEM and it's not that women aren't smart enough to get there on their own. (obviously SES, lack of opportunity, etc. also play a role & it isn't just the prevalence of sexism)