A good buddy of mine transitioned (surgery, the whole 9 yards) just after moving away from Calgary. I had FB back then and an eerily familiar looking ugly chick showed up on my friends list. The next time we talked he filled me in and asked if I'd still go for a beer with him. That's an affirmative.
We never did have that beer cause he +my bad) dropped off the face of the earth, but I would have.
No problem means live and let live. Date or marry? Nope, not in a thousand years. He'll, I'd let loose my inner cave man if that trap was sprung on me. But I wouldn't ostracize them for something I don't understand.
Bodily autonomy/integrity is probably at the top of my value system after all, so who am I to interfere with an adult's self determination?