I don't get into the blacklisting agent game either. That would be an injustice to my buyer/seller. I will cringe though, when a "problem" agent turns in an offer.

As for the guys on the show: would it be an ethics violation to speak poorly about Realtor (c) agents in general, or about a specific agent while mentioning his/her name?

Honestly, that kind of behavior among agents is pretty widespread in my city.