from his and his friends point of view, the sets where bad sets, and in their eyes, the fans where stupidly trying to defend a line that in truth contained some of the worst looking Constraction sets released by LEGO.
infact, in another video they made, on of Mr. Cup's friends said that constraction was going to end, and he blamed it on CCBS, he blamed CCBS because in his eyes, it was a very simple and standard building system. infact they all stated that Constraction was going to die, and (i think) Mr. Cup said that if Constraction ended it would be a really though time for LEGO... But i have no idea where he reached that conclusion.
here is the video
but if we ignore them, then they will proclame that its true that the community is toxic, we have to also hear what the nay sayers are saying, so that we can understand where they come from, true we don't agree with their logic, but we would still have to hear them so that we know their reason, rather than ignoring what they say.