When a person with crummy but popular arguments says that “truth is relative,” I understand their motives.  They’re denying that anyone else’s arguments are any better, and hoping that there’s safety in numbers.  But when a person with clever but unpopular arguments undermines the notion of truth, I’m baffled.  Case in point: Scott Sumner remarking that:

I think the best way to approach this issue is to use Rorty’s maxim
“truth is what your colleagues let you get away with.”  Truth is
socially constructed.

So I guess all of Scott’s complaints about the recent folly of central bankers and the economists who apologize for them are false, because their colleagues are certainly letting them get away with it.