Bad attitude towards customers

We are all standing in the queue, waiting to be assisted, this guy, Jeff comes out of nowhere and calls people who aren't even queuing to assist them. We tell him that we are in a queue and he starts shouting that how is he supposed to know we're in a queue? To which we all answered that he is supposed to ask. His attitude overall just left much to be desired. How he is allowed to work with customers, I have no idea