Not mean-spirited. Just honest. If this were a private conversation, I'd keep my thoughts to myself and leave in search of more rational company, but when someone starts publicly saying things like...
(all of which are grossly unfair readings of Eliezer's coment)
...then I think some bluntness is called for.
Not that much more unfair than proclaiming something thoroughly refuted and uninteresting based on a single post rebutting the least interesting claims of only two authors, especially given that what appears to have gotten picked up as the central point of the post (NK/SK) is wrong on many different levels.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.