I honestly have a real problem calling a man a woman. The counter argument has always been: what harm does it do? But, honestly, I don't know the answer to that question long-term. What social harm occurs when we start calling people whatever they want to be called. My hunch is: a whole fucking lot of harm.
If I said to you I wanted to be called "Duchess Dorothy, Queen of the Penguins", I don't think you would do it?
Why should we call people whatever they want? Should we bend reality in other ways, too? If fat people want to be called skinny, is that the same thing? What if assholes want to be called saints.
I don't see how it is in any way beneficial to lie to people simply because they want to be lied to.
Let's call Asian people African American because they request it?
None of it makes any sense to me.
(I am well aware these are not popular opinions.)