Gregory's ServerI think that without active, and perhaps Draconian, moderation then any public forum can find itself afflicted by a variety of unpleasant creatures , such as are plaguing you .
When Mastodon was small, we could depend on site owners to moderate, though not all did. As it has grown moderation has become less effective.
The fault lies not in the platform, but in humans. Some of us are not very nice.
I hope you find a way forward.