But the blogger's position is one that is often met with hostility round these parts, for reasons that are unclear to me.
I think some of it is a defensive reaction to perceived possible vaguely-defined moral demands/condemnation. Here's a long comment I wrote about that in a different context.
Also simple contrarianism, though that's not much of an explanation absent a theory of why this is the thing people are contrarian against.
the parts of social engineering that I think LW is worst at.
What are those?
More sympathetically, people might (well, I'm sure some people do) see avoiding stereotype-based jokes as a step towards there being things you can't say, and prefer some additional risk of saying harmful things to moving in that direction (possibly down a slippery slope).
As Multiheaded added, "Personal is Political" stuff like gender relations, etc also may belong here.