>>the black customers...are always greeted by the black cashier with smiles and conversation, but as soon as the white person steps up,...the smile disappears...and a militance [sic] takes over, displaying...obvious contempt for a person of the caucasion [sic] race. No amount of trying to be friendly will crack the mold...
Let me suggest what may be happening: Blacks are so used to being ignored by whites that they wait for you to make the first move. As an airline pilot (30+ years), I always tried to say goodbye to my passengers. I could count on one hand the times I was ignored or stared at contemptuously by blacks.
If that sort of thing does happen to me when I’m the customer, I confront it directly by asking to speak to the manager, keeping race out of it, and telling both the manager and the cashier that I expect to be treated politely in any place I spent my $$. You initiate the conversation - start out with a smile on your face and being chatty; if you don’t get the same, raise hell. Stealing, and rudeness to the customers is an easy way to get fired in any business.
BTW, Cubans in Miami (no, I didn’t say “Latins”) are notorious for their rudeness to Gringos. I have no problem confronting them, either.