Zed has given immense amounts of code and work to the web community as a whole. It would be characteristically unlike Zed to not defend his work from what he views (and many others, I assume, including myself) as a savaging of his work.
So if you view it from that perspective? This is just par for the course with Zed. I, for one, appreciate someone who is so passionate about their work that they go to such lengths to defend it.
(Edited: Forgot me some commas.)