I'm a guy so I realize I don't see or understand everything from women's perspective, but I'm genuinely surprised by this. I've worked for decades at companies with mostly engineers and mostly men, and my experience is that engineers have on average much more progressive views than, say, my neighbors. My current company recently switched from a male to a female CEO and I haven't even heard anyone mention her gender, much less express any negative views in connection to her gender. My previous employer also had a female CEO and it just wasn't a thing on people's mind. At my current employer we have anonymous surveys to find problems in the workplace, and there were exactly zero people who reported observing any sexist actions.

I've heard sexist remarks twice in 20 years, and both times I was so flabbergasted that I didn't know what to do or say before the conversation had already moved on. So if I'm bad at speaking up when it happens, it's only because I didn't get enough practice.

Where I come from, the engineering fields are dominated by men but medical fields have a female majority. I wonder what's the difference with medicine

I'd recommend Acollierastro's YouTube video about the rampant sexism, sexual harassment, and sexual assault in physics and astronomy. While engineering is certainly a big part of the equation, every hard science except biology is dominated by men and that definitely feeds all of these issues

Anecdotally, the biological engineering department at my university has a much higher fraction of women than the rest of the college of engineering, while mechanical/aerospace has the lowest, so it varies even within engineering.