I mean, personally, I would not call Gregor 'women are cunts' Murray 'he; because it's not worth my time to get entangled with a misogynist, but I'm sure as heck not going to call him 'they/them', when he is clearly, in every cell of his body, male.
I can be forced to not call him 'he' - refrain from speech (I mean, not a slur, just the truth, but whatever), but the workplace has no business compelling me to refer to him as anything else.
A bible believing Christian can be asked not to talk about how all gays are damned at work (refrain) but cannot be required to affirm the value of same sex marriage (compulsion).
And outside of work ? People must be free to say things that are objectively factual, and describe reality, otherwise what kind of world is this ?