The criticism may be justified but jeez the person who wrote that comes off like a HUGE asshole. Reminds me of people I've worked with in the past who think they know everything and have an arrogance so thick you could cut it with a knife.
(The Clojure and Racket people are supposedly nice.)
There's some here (http://xahlee.info/Netiquette_dir/death_of_a_troll.html) and classic discussion can be found at (https://wiki.c2.com/?SocialProblemsOfLisp). The rest of the odd pattern of every Lisp programmer I've ever met being an asshole is mostly lost to IRC history, but I guess RMS is another example.
"What a whiny little bitch." -- wudangmonk, https://news.ycombinator.com/item?id=27601530
When I look at these two statements, I wouldn't describe the first as being particularly abusive.