Advice
Some people lack the basic common decency used in appropriately acknowledging and conversing with others. Others are entitled and believe that no matter how many people have been waiting before him, he must be helped first , because his issue/item is most important. It’s important to realize that you will have to deal with this egotism and misguided rage because some people can’t understand that you aren’t there to please them, you’re there as a middleman for the company. Yes, keeping the customer happy matters, but not any more than basic respect.