American test audiences literally said that for I Am Legend which combined with studios unopinionated cowardice caused them to ruin the ending, amongst many, many, many other times that test audiences have given bad artistic feedback.
His anger should probably be focused at the showrunner / studio, but I'm guessing he's not risking burning those bridges so is instead blaming the only other party in the decision making process, the test audiences.
You do have a 20% illiteracy rate, and the response is that American test audiences have ruined very obviously good plots with their stupidity many times before.