They’ve learned that every time women speak up, there will be a dozen people with “theories” about why they’re lying, why it doesn’t matter, or why they’re not involved. Another dozen will opine about “inherent differences” in the sexes to explain differences in STEM employment, and another dozen will divert the conversation to some flavor of, “well that happens to guys too!” There’s a script that plays out, an exhausting and predictable script of denial, dismissive commentary, and deflection.
So what people learn is that they can get away with it, because usually they do. Not only can they get away with it, but dozens will leap to their defense. Watch how this thread unfolds, and compare them to previous ones. Look at the eagerness with which any suggestion that women are less suited for STEM than men is gobbled up and reposted to death. After a while people realize that STEM is full of people who use their brains to make disingenuous arguments to cover their ideological asses.
Edit: ...And now you’ve been flagged to death, meaning 10+ people flagged you in 10 minutes or less. I’m not even a little surprised.