However, trans people are not claiming to be birds. There are not restrooms labeled MEN and BIRDS.
“I now pronounce you man and bird.”
Half the human race is women, not birds. I can put bird juice in someone and they don’t sprout feathers. I put girl juice in my body and I develop breasts and my skin softens and I smell different and cis straight guys ask me on dates.
Your argument, alas, just might be for the birds.