Really? The LW website attracts aspergers types and apparently morality is stuff aspergers people like.

That's true, and usually I say 'a lot more' rather than 'slightly less'. However in this instance Eliezer seemed to be referring to a rather limited subset of 'moralizing'. He more or less excluded being obnoxiously judgemental but phrasing your objections with consequentialist language. So the worst of nerd-moralizing was cut out.