He likely thought you were trolling. I disagree with him on make occasions; I even made a video response addressing one of his videos. He doesn't block on the basis of constructive criticism, but he rarely responds in a constructive manner. Normally he'll reject you in a circle-jerk type manner, and then ignore responses to that. He really isn't the best at these types of videos. After looking at his channel, he's kind of changed the types of videos he makes over time, so maybe he's doing something that he's more skilled at.