Boy, did that suck. Every little thing that happened, I couldn't help but think through all the mistakes and omissions being made. I can't imagine doing the same thing at the scale of YC.
I'll probably do it again. I love writing and expressing myself. But I can see where PG did the right thing to get out of the light a bit. I remember on HN the guy would say something like "It's raining outside" and 14 people would respond with misunderstandings, clarifications, arguments, nit-picking. At some audience level all in the same room, it becomes impossible to communicate back-and-forth. The long-form essay is probably best.
That said, other than that I disagree with you. If someone wants to have their opinions taken seriously they have take other people's opinions seriously as well and can't get angry as soon as people disagree.
Personally I think many of his essays aren't very good, but there just isn't any practical way to discuss them. And frankly I don't think people are really that interested in doing that either.
As an uncomfortable public speaker myself, when I've been in that situation of being introduced at the beginning of a Q&A session, my mind is mostly occupied with mildly anxious thoughts about how I'm going to get through the talk without freezing up or saying something stupid. I'm not paying close attention to what the host is saying.
It's worth considering that one of the reasons PG stepped away from being president of YC seemed to be that he got sick of having the minutiae of his words and actions scrutinised and presumed to be motivated by malice. There's a reason his preferred method of public communication is long-form essays.
As the parent to your comment pointed out, he's been at pains to credit his co-founders in the past, and shows no signs of having an ego-driven need to be known as the sole founder of YC.
Maybe give the guy a break?
[1] http://www.paulgraham.com/speak.html