As with everyone, there's things that you as an individual can let slide and be OK with, and there's things that another person can let slide and be OK with. My wife's an engineer (PE) in a very traditional male-dominated field, and she's good enough at what she does that she gets put on the big projects as the lead. When she deals with prejudice and outright insults from older men, it's like water off a duck's back, because she's dealt with that situation for her entire education and career. Other women or younger men who treat her as an inferior really get under her skin.
This means they're less likely to put up with bullshit, and are more likely to be lured away to places that are less prestigious/competitive but allow them to actually have a life.
Generally speaking! I enjoy being pitchforked and set on fire, pseudonymously at least.
If your org has a higher female % than the population it sources its applicants from, would that not raise more suspicions of sexism?
But even if that were not the case, I'm inclined to reject your subtle insinuation that gender balance in the field isn't a problem companies should worry about.
I have a suspicion that women who get into tech tend to be more self-assured than the average individual (by virtue of the fact that they're willing to fight what looks like an uphill battle to get into the field). And that those people are also more likely to look around for a better opportunity and not be afraid to grab it. Which would make them inherently difficult to retain.
(I also have a feeling that talking about women in tech in any kind of generality is a good way to get pitchforked and set on fire, so I hope I haven't said anything out of line.)