It is sane but not rational, sometimes factually correct in places, highly offensive, and inflammatory. I don't use Clojure and reading it makes me never want to use Clojure.

Everybody is entitled to say (but not dictate) how something should work. Holding and expressing opinions is an innate human right, and the developed world only takes it away in extreme circumstances. Talking about open source governance is not an extreme circumstance.

We are not legally entitled to basic politeness, but politeness is enforced socially rather than morally, and failing to be polite means risking social consequences. If I used Clojure and I read the linked article, I would avoid hiring Cognitech, which is the exact problem Rich mentions.