The difference between being unwillingly ignorant and being ignorantly stupid is not knowing something, and thinking that someone that does know something is pompous.

Now, I'll give you the benefit of the doubt because you're a .de Lemmy, but in American Best Buy, the people op is talking about are supposed to be salespeople who's job is literally to know basics about what they're selling. There's even people dedicated to each department for that reason. Kind of like Power, if you have that there (we have it in Finland but I know it's Swedish).

Or to put it in a term you might know, imagine going to a car dealership, and the salesperson doesn't know if the gasoline car they're saying you should buy is a V4 or V6, and can't tell you how many MPG it gets. They just know it's a car made by (brand).

I take it you haven’t shopped at a Best Buy? They do two things well: have department “experts” who will shadow you and let you know in no uncertain terms that they know everything there is to know about their department and confidently give you incorrect answers (they have supervisors monitoring them to ensure they are behaving in this manner) and sell you extended warranties.

Generally when I go to a store, I just want to buy a specific thing I already know I want to buy. I just want the salesperson to sell it to me. That’s almost impossible to do at a Best Buy. It’s not a salesperson issue; it’s a management issue.