[Skavau, on Piefed and Lemmy] They're not free speech zones though. Assuming that's what you want. Most instances will have specific rules.
Even if the OOP wants that "freeze peach", that boils down to "waaah! I want to scream sluurs! And how much ~~of a social failure I am~~ I hate marginalised groups!", it would be perfectly possible to create a Piefed or Lemmy instance to host it. So even in that case the Fediverse would be an option...
...as long as the person doesn't feel entitled to be heard by people who don't want to hear their shit, you know? Because, as soon as someone created such instance, most other instances would (IMO correctly) defederate it.