I've worked in several different grocery stores.  To be honest, I've done the exact same thing that this cashier did.  When customers were jerks, I gave them hell.  When they were nice to me, they got preferential treatment. Did you notice that the Crisco vacuums were almost always bitchy?  The fatter they were, the worse they behaved.  It's like adipose destroys the section of the brain responsible for civilized behavior.  Not to mention that those hungry, hungry hippos always smelled exactly like their namesakes.  Honestly, I wasn't a shitlady until I started working with the public.  I actually have a t-shirt that says, "I used to be a people person, but people ruined that for me."