The problem there is that, at the end of the day, it's a fallible human putting stuff in the "bullshit blacklist". It also means that you're evaluating a statement based on its source rather than its merits, which is.. bad.

When you're the #1 source of information on stuff in the world, that's an awful lot of power that can be trivially abused (e.g. "let's just blacklist unfavorable coverage of this lawsuit against us").