Pizzasgood

Wrap it in the wire, then spin one of them. That part’s important! Won’t do anything if you don’t spin it.

It doesn’t say “a female behind.” That would be fine. It says “a female’s behind,” using the noun form of female to refer to a woman. Normal people don’t refer to a woman as “a female” outside of technical contexts like medicine or science. In casual speech it comes across as dehumanizing to call a person “a female,” and this is a speech pattern that is primarily used by misogynists, especially the incel variety.

The preferred phrasing would have been “a woman’s behind.”

That said, giving the person a permaban over this seems pretty excessive unless there’s additional context.

I’m one of the few here who seem to understand how people actually communicate in the real world

Nah. People in the real world don’t use the noun phrase “a female” when referring respectfully to women. They say woman, lady, girl, gal, or something along those lines. The only times a woman is called “a female” are in technical contexts or when the speaker is a misogynist.