Don't know what may or may not have happened but generally, if you are good, more will contradict his negative view. Don't worry about it. There are going to be goof and bad reviews, honest and dishonest folks. The only best thing to do is be true to yourself, give what you can to a session, and the rest will follow. That doesn't mean take dishonesty without clarifying the truth, just don't let it bother u too much coz it has very little impact in the long run.