Even pg participated in Lisp flaming; what he said about newLISP on LtU, for example. It's tradition!
But yes, Lisp flamewar is not very productive. I do think there's a debate to be had as to whether or not Clojure is a Lisp, though, and the quote was offered to give a humorous example of a macro posted by people who are against Clojure in it, since stelcodes seemed to be unaware.
This sort of hyper-rant did years' worth of damage to the CL community and I'd especially not like to see HN be a vehicle for its return. As for Clojure, Rich knows at least as much as the rest of us do about the design tradeoffs it took to get a viable Lisp on the JVM.