I have to put this first: I usually really like your show. And I'm noone who comments on youtube usually, but:
This was an absolute shame. I did not ever before saw Peter's work or him personally,but he came around as a total (arrogant) d*ck. He hardly said anything at all, and if he did it was nearly 0 helpful or constructive. He complained about peoples facial features. He complained about every lighting he does not do.
The only true thing he said was effectively the only thing he said: it's about the expression. What expression, he could not really show nor explain. We don't need such "critiques"! The only time he did not seemed bored and wanting to be somewhere else was when he was advertising his stuff.
And you guys did not shake him up, but encouraged and defended him, getting as rude and bitchy as he was.
I said it already: It was a shame.