My biggest problem with liberals is not that they have different views than I do. It isn't even that they want to impose things on me that I find offensive.
Turns out they can fairly say much the same thing about me in relation to them. (Biggest difference is I rarely care to reach across State lines to impose my views but only care to set the culture and mores of my community; while liberals are not content to confine their influence to their neighborhoods, but really must micromanage the entire nation.)
What really gets under my skin is the view, almost universally held among liberals, that conservatives, the religious, and rural residents are idiots deserving of nothing but scorn and in need of the liberals' superior intellect.
While this contempt for most of humanity is nearly universal among the liberal elite, sadly, it is not unknown among conservatives, libertarians, and others.
The OP demonstrated the same contempt for his fellows that I find so offensive in progressives.
He assumed that two clerks, working in a store that carries fuel hose were both complete idiots. Not a second's indication he considered that maybe their question makes perfect sense and is entirely intelligent and legitimate. Maybe something about the exchange, not related here, makes that a reasonable assumption.
Or maybe, some people are just miserable human beings with a pathetically low regard for anyone but themselves.
The possibility that the question from the clerks wasn't based on stupidity seemed worthy of exploration.
Charles