I was picking up some parts for a (very technicall...

I was picking up some parts for a (very technically proficient) friend who wants to build a computer. He instructed me not to change any parts if prompted to do so by the staff - and I can see why.
These guys nit picked at least half the items on the list. It wasn't even like they were trying to help, just extremely condescending "why are you getting X, thats terrible, you should be getting Y instead."
Even after I explained to them that I was getting them for a friend and that I was not to change any of the parts, they still banded together like Hyenas to tear apart the messenger.
Maybe Computer Arrogance is a better name for these guys...