I think this is just a form of propaganda. If you really want a name then maybe Ad Nauseum.
Tricky to moderate. You need to identify, and have objective evidence of, a pattern of behaviour from a user. It needs to be enough that an independent ambivalent third party would agree that the intent is propaganda. I think this is kinda impossible honestly.
If its a small ~~fiefdom~~ community, just ban them.

I don't know a lot of trans people.
Do they usually pick the opposite-gender-version of their birth name? Seems like many do not.