What would happen if you joined Liberal City and duked it out with people, not on Mastodon dot Social, who don't mind it? You wouldn't get banned from Mastodon dot Social if you didn't bother anyone on that server, right?
I agree that you should be able to fight with others who want to fight, but if people want to insulate themselves I personally think it's fair to do (even if I might try to convince them to open up a bit).