I don't know, but every time he writes something like this, it becomes a little bit harder to buy his "it's all an act" spiel. But he's not at all unhinged! I mean, who are you going to believe, Zed Shaw or your lying eyes?
I've hung out with him in person. He is a nice guy in real life, though very opinionated and with an overdeveloped sense of justice. He believes strongly in being nice to people who are nice to him and the converse.
Character is how you deal with people who aren't nice.
It's amazing to me how many people have still not come to terms with that truth. It's written in the oldest books in the world. I think it's particularly apt for the Internet age when conversations with strangers happen regularly.