Zed also pointed out some genuinely bad stuff that was happening in the rails community in: http://harmful.cat-v.org/software/ruby/rails/is-a-ghetto which made them more angry.
Edit: a user points out below that post came before the ZSFA site. I'm not sure that matters.
He also claimed Ryan Dahl ripped off Mongrel's HTTP parser. The flip side of this (which I've heard from someone else involved in node) is that Ryan Dahl is super talented and just read the damn HTTP spec like Zed did. I honestly don't know enough about HTTP parsers to say either way.
Zed's talented: Mongrel and Lamson are in the top of their categories. Learn C The Hard Way is a modern, but still fundamental C book. Any interaction with Zed I've ever had has been brilliant.
[1] The people who got angry at ZSFA in the late 2000s are probably the same people who write Jenn Schiffer angry tweets for writing tech satire these days.