Today, I think it's clear who would be being laughed at by whom. The fates of places have so radically diverged that we no longer have a sense of collective identity. All of the places listed in Crap Towns are now unrecognisable, for better or worse. Those familiar shops are now gone; in some places they have been replaced by artisan bakeries and pop-up boutiques, while in others they have been replaced by charity shops or nothing at all. Half the leisure centres have shut and we all know which half.
The upper middle class might have become more humourless and puritanical, but I think that's a subconscious self-defence mechanism, a manifestation of noblesse oblige without real obligation. The working class are too angry to laugh and certainly aren't willing to be laughed at. We all know that we're teetering on the brink of a populist wave, but no-one in a position of power seems willing or able to do anything about it.