This is because there are some people (I have met some) around today who genuinely think the only difference between the sexes is in how they're perceived.
For example they are convinced that there would be no sexism in the workplace if all women wore trousers and flat shoes.
These people, ime, are usually young and have had no experience of (say) the completely different experience men and women have when becoming a parent, both physically, socially and financially. Or the different experience of unwanted sexual contact for men and women (ie a man can usually simply walk away, whereas a woman is overpowered).
They do not believe in the inherent physical dimorphism between the sexes. They just don't believe it.
Nb I'm talking now about the enablers, lanyard wearers. I think many predatory men know exactly what they're doing.
Edit: when I say a man can walk away, I mean from a woman. I know men can be abused by men.