Cooking up global fediverse rules specifically meant to try and exclude an instance is crossing the line imo. If you don’t like interacting with them, join one of the many instances that have already blocked them.
This kind of crusade goes against the spirit of the fediverse imo.
He’s a tool for manipulation first and foremost, and therefor must be relatable regardless of any grammar rules or even what’s actually written in the Bible.
They would probably use “they” instead in any case, if it were to change. “It” is for objects, pets and clowns.