When I use to work in Whole Foods I loved these customers. Why? Because I literally didnt care if I got fired. It was a job I was doing until I got my Fire/EMT card. I would be super rude right back and be like see thats how you are with me now if you want my help treat me like a human being or Im walking away. It worked half the time the other half they would demand a manager. I tell them Im getting my manager and never really do instead go in the back to get my co worker to tell them there is a hungry hungry hippo in the candy isle, and we would laugh.