Unfortunately there isn’t a finer grained tool. You can ban users, but if the instance they’re from has open sign ups the banned user can just create a new account and return to harassing people on the server. This is the reason that Beehaw defederated with the two earlier this week. They tried everything they could before then, but the tools just aren’t there yet to not punish the whole instance if the instance’s admin isn’t willing to meet part way.
Unfortunately there isn’t a finer grained tool. You can ban users, but if the instance they’re from has open sign ups the banned user can just create a new account and return to harassing people on the server. This is the reason that Beehaw defederated with the two earlier this week. They tried everything they could before then, but the tools just aren’t there yet to not punish the whole instance if the instance’s admin isn’t willing to meet part way.
Yup, that’s dramatic. The fediverse still has a long way to go.