Fine. There's a world of psychological difference between "I'm talking to you" and "I'm shouting at you through back channels because I'm being ignored." The fact that this very functionality has been available on the most basic PHPBB and vBoards since the mid '90s illustrates that you know what? It's a manageable compromise. If I'm allowed to indiscriminately post content, I'm allowed to indiscriminately ban content. I owe you jack shit. I owe this website jack shit. I owe MK jack shit. If I decide that I'm not interested in sharing any more, I get to yank what I wrote. If I decide you aren't allowed to comment on my posts, you shouldn't be allowed to comment on my posts. If we're in a world without tags and following users is everything then you know what? I deserve absolute, granular control of who gets to follow me. Fuckin' A. And the fact that everyone is there because they followed that user means it is that user's prerogative to scuttle that discussion. You want to have it not dependent on the user? Then have it fucking dependent on the tag. Oh wait, that's right. We got rid of tags. Guess what? You're my fucking hostage. That's the only way to do it. If you're making me responsible for my content, you're giving me responsibility for my content. Don't like it? Don't follow me. Don't share my posts. I should have Every.Fucking.Right to act as absolutely antisocially as I so choose ( up yours mk) and the site should be able to deal with my antisocial nature by ignoring me. I have damn near five hundred fucking followers. Every time I click on something I have to think "do I want 500 fucking people to see this?" probably not. Would I like to limit the fuck out of that? You're damn skippy. My alternative is sockpuppets. Do I want to hear every cockamamie thing you say? Abso-fucking-lutely not. But now everything you say is sitting here so I can either let you spout off at the mouth or engage you. Or, I can turn off notifications from everybody. My behavior will find a way on the site, whether the site adapts to me or not. The fact of the matter is, I'd given up on the place until syncretic decided that what it really needed was a thousand new people flooding in. His response was to tear away most of the functionality that made it usable and leave a hulk where the cult of personality reigns supreme. FUN FACT: my Hubski page is a hell of a lot more interesting when I'm logged out than when I'm logged in. I think that indicates beyond a reasonable doubt that it's broken. In other words, "what it's about" is a bad fucking idea. And it didn't have to be.If someone was antagonizing you, and you blocked them from seeing your comments, they could still see replies to your blocked comments, or references to your conversation in the thread.
If you're talking about blocking a user's comments, as well as blocking yours from them and maybe blocking the responses to your comments as well, then that's starting to get into abuse ban territory where members can indiscriminately block users to public content.
For example, a popular user who has a lot of followers posts a link to a major trending story. If that becomes the de-facto place for discussion on the topic on Hubski, then having the powers you are suggesting, you could simply block users of your choice from the biggest major discussions on Hubksi for major news events.