Thanks for the response. I'm doing badly at asking these questions. I tried the hush and filter buttons before. The hush button puts comments that person started on the bottom of the comments. Since a lot of people respond to other people comments, I would still see their comments. For me, the filter button just puts a line through the person's name, but I see their comments if I open a post. Supposedly their comments don't show up in my feed or chatter, but that's not how I find comments. From what I can tell, their comments still show up in the post the same way, just with their name lined-through. I didn't want to try the mute because I was afraid the person might be notified.
Hmmm... Based on the descriptions, I thought one of them might have done what you're looking for... mk forwardslash or thenewgreen did I read the descriptions wrong? Mute or block won't notify someone per se... But if you use them, the other person gets a "you are muted here" instead of a reply button - so yah, they quickly find out. Edit: I just re-read and see that filter takes your content out for my feed and chatter... But not from the post itself... Hmmm. I wonder if the kind of moderation you're looking for is possible?