Just because I’m in retail, doesn’t make me stupid

Do you hate it when you are trying to explain something to a person and they treat you like you are a complete idiot or that you are lying to them. I have customers daily, especially during clearance season (which is spawn of satan), talk to me like I am trying to lie to them or am stupid. “Do you have any more in the back?” I answer, “No.” One would think that would be enough, but what happens next, “Are you sure you don’t want to go double check?”….WTCrap. Why would I want to go double check. I put them all out myself, and we haven’t had any back there for weeks, if I had it, I would sell it to you. I want you to buy it. And it’s not just once, they will ask you 10 more times before they leave, “Are you sure they’re all out, you don’t have any put aside?” This is not just with sizes, it also goes to color and if the shoe is on sale. I am competent (is that how you spell that? otherwise I’m proving incompetency), trust me. You are the whose elevator does not go all the way to the top, leave me alone.