I find all his digs at javascript funny since, at least the way I use it, javascript is basically an ugly-looking scheme. Javascript is responsible for my 'lisp enlightenment' with the language using first-class functions and closures, and the wide variety of precompilers. It strikes me as fashionable to hate on javascript.
Java on the other hand, now that's a horrible language ;) ;)
Actually, sweet.js is based almost entirely on various macro innovations developed in Racket (such as the Honu approach to macros in languages without parens).
I too am amused by his opinion of JavaScript. A professor was moved enough to translate most of SICP to JavaScript and writes in its first chapter, "Above beyond these considerations, programming in JavaScript is great fun" [1]. I agree, and I'm enjoying going through this SICP/JS moreso than the original, as I can write solutions to the exercises in any old browser JavaScript console and paste them into a gist for safekeeping.
I was thinking the same thing as I read it but I can conceded that its easy to overlook how much influence Lisp had on JS. I also find it mildly amusing to see all the Lisps written in JS that keep popping up lately.
Java on the other hand, now that's a horrible language ;) ;)