Even as a parable, the story fails. The store owner returned rudeness with even worse rudeness.With regard to the story of the store keeper and snooty customer, I think I understand the difference in our opinions. I interpreted it as a story of moral principle,(like one of Aesop's Fables) while you understood it in the context of business ethics. From your viewpoint, within that context, you would be correct. I think this is one of the differences that keep atheists and theists from understanding each other. Our perspectives are different, and so are our concerns.
At worst, the smartazz would-be customer insulted the store owner and/or his store. Big deal. As a public servant, he ought to be quite used to such boorish behavior by now.
But what he did in return? He caused deliberate harm! He wasted the entire afternoon of the other man, and possibly got him dangerously lost-- could have happened.
All because of his pride.
Two rude behaviors do not a lesson teach.