Gender fluid? WTF

I always considered myself to be a fairly easygoing and tolerant person. I really don’t care if some man wants to marry another man or woman marry a woman. 

But that is no longer enough. To avoid being condemned I must now believe that a person born with a penis is identical to a person born with a vagina just because they say they are.

Remembering though that they can also decide they are gender fluid and tomorrow can go back to being a man. Then they can be offended if you call them by yesterday’s choice of gender.