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You're playing right into the hands of the kleptocracy by trying to start this dumb-ass discussion up again.
To be more charitable: people should really read more and try to understand more about the difference between biological sex and gender. Many people think there is no difference and that's why they have such a reaction: "but they are trying to change something fundamental about biology!".
I used to have trouble with it as well, coming from a more traditional society.
As for the other wacky beliefs: they are mostly exaggerated. When talking about police, most leftist I know don't _literally_ want to just dismantle the whole thing and replace it with nothing. The point is to highlight the absolute lousy state of affairs, more than it is to discontinue the notion of policing.
People can not (mostly) change their sex (AFAB etc).
However, there are a vast proportion of potential gender expressions, and it should be entirely uncontroversial that people can choose from them.
And now, given that I have disagreed with both partisan (US) positions on this, I'll withdraw.
But it's such a tiny proportion of the population, and matters much less than making things better for the populace (which is the whole point of governance).
I'm not a Marxist, but the whole culture war stuff is very very convenient for those who don't want to work on reducing inequality (by taxing the upper earners more). And given how much of the Democratic vote is dependent on these people, I guess it makes political sense in the short term.