Important thing to note, though, and why I don't block individuals anymore (instead I tag them):

Blocking a user doesn't prevent them from interacting or replying to your posts. It just hides everything they post or comment from you, as well as any replies afterward. It's a reverse shadow ban, because it makes it so you are the only person who can't see what they post.

I personally recommend just tagging them in red and feeling smug in your ability to ignore what they have to say.