Pretty hard to make that stick when the institutions that DEFINE what mental illness is and is not say "it's not."
And He answered and said, 'Have you not read that He who created them from the beginning made them male and female.'"
-- Matthew 19:4 (NASB).
Sorry, but man's definitions in such matters concern me not at all.
If you think that it's possible, at this point, to "argue" or "analyze" this situation away, on human terms, with respect, you are seriously mistaken. Man is being given over to his delusions.
Then go and bury your talent....