Half the comments are incited by Shofus constant negative remarks in regards to Reborn. He's a public figure whose opinion holds sway over a large part of his fan base, naturally, so when he gripes about Reborn a fair part of his fan base is going to hop on that band wagon. It doesn't hurt that he actually gets through a gym within one episode, thus progressing the game and making it a better viewing experience for those interested in the game.
Therefore, I ignore most of the youtube comments, if I watch the video at all. If someone wants to act that way, I don't want to interact with them. Anyone with even a few months of experience on the internet knows one trolls opinion hardly has an impact on those choosing to try the game. Let him complain,, so long as it's elsewhere.