Hehe, this is true. Kamarkim, if you'd like me to make you feel better I'd be happy to share some old "dumb customer" stories from when I worked in a gas station. My favorite:
CUSTOMER: *looking right at the shelf with the bread on it* Do you carry bread?
ME: Ma'am?
CUSTOMER: I need bread.
ME: It's on that shelf, right there, ma'am.
CUSTOMER: Don't you have it anywhere else?
ME: No, ma'am. If you're looking for buns, I think we're--
CUSTOMER: Did I say buns? What are you, stupid? I want BREAD.
ME: Ma'am, all of our bread is right there. You're looking at it.
CUSTOMER: Well, this isn't bread. I see white and wheat. I only eat MULTIGRAIN.
ME: I'm afraid we have to stock what's most popular because we have so little shelf space.
CUSTOMER: Well then you should stock something that's actually healthy, not this garbage. I want to speak to your manager.
ME: I'm the assistant manager, ma'am, the manager is already home for the evening.
CUSTOMER: You're lying!
[This exchange continued for some time while I tried to explain that corporate decides what goes on the shelves, my manager had gone home three hours before, and that I did not appreciate being disrespected this way and would like her to leave . . . . now . . . . really, ma'am, before I have to call the police . . . . when she finally left the store it was while talking the ear off a police officer and telling him I should be arrested.]
Asking if something is as good as a national brand? Would hardly register on my what-the-eff meter. You can see what your competition is . . . and that wasn't even the craziest thing I ever had to deal with.