I think people like Max have some sort of fundamental prior investment in the concept of women having different brains to men. And it's that investment that causes them to react so weirdly to challenges to gender theory.
I've noticed this with other men that support gender theory. There's some sort of innate belief that women are acutely different psychologically and mentally to men, that they really do have "pink" brains.
So therefore, transgenderism fits perfectly with this existing belief. Said transwoman declares pink brain status, therefore sad transwoman must be an actual woman.
It seems as though these individuals believe on some level that two qualities denote type: biological sex and "brain expression" with "brain expression" being the most important in terms of civic society.
Now I would argue "pink brain" beliefs are an acutely misogynistic sphere of reference, but asking why these men have these beliefs will probably get us closer to uncovering the murk that exists in their heads about the opposite sex.