Here’s a [Blacklist Filter]. I just inverted the logic of my [Item List Filter], which is a whitelist.
It’s not tested, but I only changed three instances of “>=” to “<”, and some labels from “list” to “blacklist”, so it most likely works.
You can read the Item List Filter thread to figure out how the Blacklist works. (Except the items you add are blacklisted instead of whitelisted, obviously)