I know and knew dozens of women in computer science degrees, this did not ever happen to many of them. We’re not harsh or unwelcoming to women here, yet the women stay away.
As an anecdotal example, A coworker made some very uncomfortable racist remarks regularly to me after I (mistakenly) told him about my ethnic background. I left that job and the guy who took my position (middle-eastern) also experienced same thing already in his first two-weeks. We would both not consider the workplace (or the group) an unwelcoming environment, but would probably answer "yes" to the questionnaire asking of workplace discrimination.
You also may not have heard everyone's stories. I also have known probably orders of magnitude more women in CS than would necessarily be comfortable sharing unpleasant stories of harassment and discrimination with me. I think it's remarkable, of the women I've known fairly well, how many had stories like this (the civil eng one was really out there, to be clear).
They didn't tell you about it, at least.