I go back to my Lexus comparison. Lexus owners, as with McIntosh don't have an inferiority complex. They enjoy what they have and don't feel the need to bash others.
I agree, and I suspect that the YouTube guy would say "Enjoy what you want. It's a free country."
What he is claiming, though, is that while you're enjoying the Mc experience, you are foregoing better quality experience with other gear. In part, he says, you're taken in by the looks of Mc. In part, you're just stuck in a comfy cage. You've settled for lesser gear. Are you content? Sure. So are those who eat pork rinds and call them gourmet food. But you're missing out on the real audiophile experience that Mc. cannot deliver.
So, he's not bashing Mc owners, per se. He's pitying them for being stuck. And he's warning those not yet owning Mc gear -- or the other brands which are not truly audiophile as he defines it -- to steer clear of those audio cul-de-sacs.
I think the Mc fans here have more or less countered these claims. I'm just pointing out that he's not really bashing people so much as saying they're deluded in thinking they've gone into true audiophile territory.