The complication with a filter like this is that other people would be responding to posts made by the filtered one, which might make it pretty hard to make sense of threads sometimes.

I think it would be a useful enough option for all that. But it's simpler to just skip the posters you don't like reading, then it's easy to track back and read them to make sense of other posts if need be.

And of course never respond directly to anything someone you've decided to blank, especially if they ever refer to anything you have said.

I've never noticed Bobert as any kind of problem. Different strokes for different folks.