Earlier quoted context omitted.
"In reality, you're not a woman, we're just pretending because we're polite" isn't a very pro-trans stance.
“You must believe something to be true that you yourself know to be false” is a very “point deer say horse” kind of philosophy.
It's not a matter of "my side has facts and your side has opinions." It's that we disagree on what the facts are. You can find a lot of scientists from a few centuries ago confidently asserting that black people are subhuman. It doesn't magically make them not-racist because they believed it to be a true fact.
They were wrong, and you are wrong.