"Certain [gender|sexual|racial|etc] identities are not valid" is a political opinion held by those to whom I am quite comfortable telling, as the official policy of SourceHut, to go fuck themselves.
Just to be clear though: are you kicking them off, or telling them to go fuck themselves? Because your comment above indicates that you wouldn't kick people off for simply having different political opinions.
In this specific case I am doing both. I will kick people off for being bigots, and tell them to go fuck themselves.