The thing with blocking is similar to what reddit does, ends up being abused by bullies. They call out you for any lie they can think of, block you, you cannot reply back defending yourself, and their followers automatically believe them and will never read about this lie, unless you also abuse the system and create a fake account just to reply... nah... that's why I stick with forums, anyone can ignore you but everyone else will still read your replies, and everyone is free to decide by themselves, not decided by a bully.
Edit: also, I prefer if an authority shuts me off, not a peer.. in a place that takes pride of letting people have freedom of speech, you cannot shut down anyone, you are the one that have to stop listening.