There should be a block feature so that users can block others from interacting with them or their posts on Forums. This avoids unnecessary discourse.
You can more or less already do that. No, you cannot keep them from voicing their opinion. Yes, you can hide their replies and turn of notifications for them.
I really don’t think that’s needed
OP has got his feelings hurt so yes of course he’ll demand to be able to blacklist people from is threads
You can hide people’s replies.