One of the main or even first rules for a lot of Mastodon is nobody is allowed say anything bad about tansgender or homosexuality an will result in account delete or ban, that much censorship is a cult.
Not allowed to criticize vaccines. I'm not talking about messaging individual users, simply a public posting criticizing trans ideology or injections, banned.
If someone reads the rules across a long list of Mastodon instances, a picture becomes clear about conformity to acceptable speech. Functional healthy adults are mature enough to ignore it or they themself choose to ban a user from messaging them, not an admin who had no part in a conversation. If one person creates multiple account and targets individuals, then yes the admin gets involed.
To prove my point, do a search for a Mastodon instance that allows obnoxious or unpleasant statements, that is still allowed to communicate with more populated instances.