Why not remove that obviously trolling comment?! It has no value and the list of stuff does not need to be preserved. The Lisp community has already good pointers to resources.
This is another troll who calls others 'retarded' to stir up controversy and have fun with it.
We don't do that as moderators, short of banning the account. I'm not banning that account because its other comments are fine, and it's better to assume that people are willing to improve.
HN's mechanism for dealing with individually bad comments is user flags, and the two bad comments in question have indeed been flagkilled.
This is another troll who calls others 'retarded' to stir up controversy and have fun with it.
Please remove it.