While it is tempting to conclude that, and my initial reaction was similar, anyone would be banned from a lot of subreddits if they were to seek out controversy by going into spaces they disagree with and state their opinions. It can say a lot about someone, but doesn't have to.

I agree with you overall, though. There are outright Nazi instances - nobody is being censored. But they have no right to force their way into communities that do not want to interact with them, and on Mastodon we have the power to enforce that, or we can choose to delegate it to people we trust.