but what if there are differences between how the male brain and female brains work that come from the Y chromosome?

This assumes that trans women are born with a male brain. The consensus of the scientific community says that this is false - being born with a female brain in a male body is how someone is born trans which further supports the argument you are responding to.

I’m paraphrasing here but essentially the SRY gene (that stimulates production of androgens in a fetus) is released at a different time than the formation of the brain. So it is possible, but rare for someone to be born with a brain that doesn’t match their body and poof that’s where trans people come from.

EDIT:

Source

Article which cites source

That was fake, unfortunately.

https://www.snopes.com/fact-check/simpsons-predict-trumps-death/

Horse*

Don’t they require a phone number now?

https://en.m.wikipedia.org/wiki/Stimming