There is an instance block, accessible from the web UI at /settings (so for you should be startrek.website/settings) blocks tab

But the big issue with it, is that in it’s current implementation it’s more of a mute rather than a block

You won’t see their content, but they can see…and interact with…yours. So if you make a comment justifiably shitting on Putin or something, they can downvote brigade you, make replies you can’t see to shit talk you etc