I'm certainly a customer, and not a super. And from my point of view the piece does not make me mad. Really, that article, with a few tweaks, could be about waiters' impressions of the diners at their restaurant or a diatribe by a cashier at Kohl's regarding the Christmas-present-buying public.
Indelicate, perhaps, but I didn't take it personally. In fact, sometimes you see players out there who act exactly how he's depicting, and saying the exact kind of things the author writes about. No biggie. I wouldn't post it either, but not because it's offensive, just because it's not that funny, or satirical, or truly illustrative of anything.
Nothing personal to the author, just my take is all.