What gender are "trans women"?

What’s a wonan

They just have the lifestyle of female stereotypes. Biological boys and girls, men and women, come in many forms and colors. Everyone is their own boy or girl, no matter the ever pressure and restrictions of fashion and norms, and that's basically it

Well I know a trans girl who still dresses like a boy.

No one can be other than transsexual though. Gender Theory (John Money 1966) is a recent ideological way of taking advantage of the mix-up that naturally occurs amongst people mostly on the autism spectrum before they learn biology. Thinking that norms and expression define your sex/pronouns.
The theatrics your friend is doing is high level theory - let me guess, he doesn't have body dysphoria?