I gave it some thought on the way home, and I have swayed a bit more to your perspective, but I still think that a good attitude is a trait that it's simply lazy for any person who presents materials to the public not to cultivate. If you're SO brilliant that you really truly don't need to be liked, okay, but most people (even most brilliant people) are not. However, I acknowledge that the value of his work, though not best served by his presentation, is not itself affected by his presentation.
The thing that sticks in my craw is his need to announce that he thinks comments are harmful and that he won't participate. Just don't participate next time, guy. Nobody's waiting with bated breath for ya!