False equivalency. The left at least advocates for inclusion, and asking your workplace not to discriminate is not "just as bad as" saying women shouldn't be able to be engineers.
This is a human issue that is not confined to liberals and women, or liberals and hispanics. If you go out to rural locales and make a big show about being liberal in a conservative stronghold, people will invariably judge and mistreat you. If you're a conservative in a liberal stronghold and make a big show of it, invariably people will judge and mistreat you. Not everyone, but some. It's not right, I don't agree with it. And I feel like plenty people are moderate enough that they would agree.
But somehow we can't stop the inmates from running the asylum. And our system seems to give greater weight to people who scream the loudest. People are smart enough to know if they scream loud enough they'll get their way. And options like compromise and collaboration take actual work, and why bother with work if screaming and fussing is accessible to everyone without any effort?
Voting is always better than not voting, even when it seems as if your vote makes no difference.
Aside from that though, yes, it is bizarre when people vote for candidates who have a track record of screwing over people like them.
This isn't unique to women.
The former is exactly what the author of the memo did, and they got fired for it.