@LutherBlissett13
I would think that should result in a report to the remote server admins that this user is engaging in harassing behavior. If they prove to be not amenable to that, then the next step is to ask your local admins to drop that instance as they're not operating in good faith.

This is the approach taken by several instances I'm aware of, including furry.engineer—because this is already extant behavior. People are just using links and screenshots instead of quotes.