The problems women face in male-dominated fields are well documented. Blog posts and articles describing the discrimination are occasionally posted on HN, and if you're a frequent reader you must have seen them.

There are obvious issues like sexual harassment. Almost every woman I know has been a victim of it at some point, but I don't know any man who has been sexually harassed at the workplace. For this reason men typically think that sexual harassment at the workplace is not a big issue.

But there's also more subtle things, that are hard to measure since companies aren't open about them, like women being made lower offers for the same job with the same qualifications, or women being less likely to be promoted, or women straight up being refused the job because "they might leave the job soon to have children".

Getting evidence for these things is hard, because companies rarely give a reason why they are hiring or promoting someone, and even if they give a reason it's very rarely something that can be objectively measured.