My biggest issue with the lack of a basic setup is that you sometimes can't tell if the instrument will ever play to your standards. Just my opinion.Or it could be the surprise people are experiencing that someone capable of a setup would get so torqued over a bass that isn't set up "well," to his taste, or to some generic "factory specs."
Most of us pick up a bass and fully expect it to be way off from our preferences. It's the norm, especially in a retail store with cluesless noob sales clerks running around. Sheesh, most of those guys are still trying to figure out how the cash register works. Anyone who desires to have one of those half-wits set up their bass needs to seriously re-think it.
I'd say questioning the OP's setup abilities is not that far out of line.
It would take the store 10 minutes to adjust the truss rod (usually tighten lets be honest) and adjust saddle height.