I think he has just had enough of all the brain dead comments from the mainstream that get created in relation to the topics he covers and how the people doing so tend to be being very well paid for it. I feel his position to be that of an outcast/underdog that sees the hypocrisy, denial and lies of the establishment. It would probably be better not to use sarcasm, but I feel that - generally - his level of understanding makes up for it (not always).
I understand that the clips are edited and we don't see the full context, however - after watching them several times I don't feel that it is invalid to use them in the way he did.
I think his intention here is to cut through the discourse and assumptions to highlight patterns that most people aren't looking at. I think part of what motivates him is perhaps a concern that the psychology involved as presented by peterson is being normalised and even given 'genius' status by many.