I find it hard to believe that Mr. Mack could feel "bullied" by a single reader on an internet forum.
I don't find it hard to believe at all. I don't think you actually do, either, as your "paying public" bit implied: David Mack is posting under his real name here, and in a venue frequented by his customers. You, OTOH, are attacking his reputation while using a pseudonym. Very obviously you are in the power/bully position here.