GENDER BENDER

I got this friend from my youth. He owns a business. His employees call him sir. His wife calls him husband his kids call him dad. He chews tobacco, coaches the softball team, plays third base and bats .330. Usually at home he is in baggy shorts flip flops and a tank top. Shaves his head an wears a beard. He dresses business casual at work, but sometimes wears a suit.
The thing is, when I knew him 45 years ago, he was a girl and one of the best friends I ever had.
So what restroom do you think this fellow should use?