Biological females cannot be male. They will never be male.

Think again. Sex change within nature happens all the time between the two sexes. Who's "literally anti-science" now? Lol

I can see someone’s sex all the time.

No, you can't. In the strictest sense, biological sex is determined by gametic production. You can't see that most of the time. What you're doing instead is relying on other thing like secondary sex characteristics and gender expression to assume what someone's biological sex is. But you're not relying on "science" at all.

virtually no one wants to sleep with them.

And here's the crux of your sentiment. "Wah, trannies are gross." I don't know why you felt the need to add that; I'm not trans, no one I know is trans, and I am not attracted to trans people myself.