I know that idubbbz ubercucked himself after this documentary but in retrospect I wonder if in this scene he didn't successfully push Sam's buttons. He did basically flee the scene after this, refusing to film further.
Did Ian Johma snatch defeat from the jaws of victory?

Btw I think that Sam's behavior has a simple explanation: after World Peace's cancellation he became a sort of red pill guru figure and giving life advice was his only source of income for years, I think he feels like he needs to protect that, the "gravitas" of his image and that takes precedence over comedy.