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This bit isn't funny because it's not open-ended and incredibly unlikely to get an interesting reply. At best it's encouraging you to say no or disagree, which doesn't allow for much of a retort in return. The best he can do is smugly reply that you're dumb, which isn't funny or interesting. Only two things can happen here: people can argue with him which is fun for nobody, or he can just repeat himself and reply in support to himself which is instantly obvious because it's clearly not the response it should get. Even if you became a willing participant and gave the exact necessary response to make the joke land, there is no joke. Even if he postures for his "wisdom" to appear sarcastic or exaggerated for effect (plausible deniability about it being a joke or funny trivia), it's mired in a desire to actually be right and convince you through peer pressure and has no ability at all to entertain.
Conclusion: this is motivated behavior. It's necessary for him to make this a reality, even if only by apparent consensus, for some reason personal to him. Even if he was trying to bait arguments to make people sick of the arguers or arguing, there is still a deep fundamental lack of support for the position, so it would do nothing.
