You probably know there is, in your CP, an item "Edit ignore list". You can name the particular person there. But I have used it, and it was not what I really wanted. It still shows that user as having posted, you just cannot see the text. What I wanted (it was related to the youtube posts, which have now, thankfully, been confined to the WaterCooler) was to entirely eliminate those posts from my view. You are , maybe, looking for the same thing?
For example, I do like to pop in to forums, on other sites, such as the watercooler. Unfortunately, on this site, the more interesting posts are quickly buried.