Too many customers are just overly entitled. I get it. They are paying their own money for your product/service. At the same time, they do not have to be jerks about it. Why can’t more customers just be reasonable?
I am not saying all customers should be super friendly or anything like that. There should be an emphasis for just treating another human being (the person giving them service) with the decency and respect they, themselves, would want if it were the other way around in another situation.