When we usually bring up this subject, it's usually about retail workers being the victims in the story and either get harassed or humiliated by customers. But this time it's the other way around, and now the victims are the customers who unfortunately were treated like absolute crap by retail workers. The moral of the story is that some people are just rude and have no manners and once they get a job they will continue to act that way and when it's their turn to be customers they'll also continue to display their crappy attitude.
Believe it or not, retail workers aren't always bad. As someone who has personally worked in retail before, I can tell you now that customers can be crazy, too.