I must confess I have a personal vendetta against Yudkowsky and his cult. I studied computer science in college. As an undergrad, I worked as an AI research assistant. I develop software for a living. This is my garden the LessWrong crowd is trampling.
Also he's getting dumber. His ideas are getting worse with every iteration and he was once a smart but annoying kid who's turnkey parents didn't keep him off usenet before too much damage was done.
He's the shittiest kind of doomer these days, too: he's lamented that the world is doomed (not to climate change or environmental collapse, but techbro "sexy robot goddess decides to kill the gross nerds that financed her construction" doomsday scenarios) and that he's to blame because there's not enough of him to solve the problem.