Rich Hickey might be very humble in person, and I don't think this blog post is necessarily arrogant (but you're also not going to convince me it's humble).
I'm not really complaining about a lack of humility or even about Rich Hickey. I just feel like Clojure is one of those languages caught up in a sort of Cult of Awesomeness, where people feel obligated to lionize the pros and downplay or omit the cons and the contributions of others.
I don't really want to use a language that's being driven by that. Maybe I'm mistaken about Clojure fitting that description, and maybe meeting Rich Hickey would set me straight, but I still think it's a reasonable perception to take away from this blog post.
Do you expect Rich or anybody else to write a blogpost that goes 'I wrote this library and here is why it sucks'. EVERYBODY writes blogpost on why what they themselfs build is good, I dont see any diffrence between clojure and other languages (or communitys).