[garentee]

The person who was "making " the coffee had no right whatsoever to ignore the customer who is the sole purpose that she is there in the first place. if I ignored the customer like that I would not have to worry about them after a while because there would be no more customers. It is just plain rude to ignore someone while you are being paid by someone else to provide a service. I do not think for a second that you would see this the same way if you owned your own business. They call it Customer service for a reason.
Your extreme case is unlikely to happen,and like everything in life there are exceptions to rules....in that case I would have set my boundaries with said customer and if they did not agree with my set of rules I would refuse to sell to that person. I have done it before... but certainly not if they were being ignored. It is vastly important to remember who pays you when you are in a situation where you are waiting on people. Perhaps Pianoman the retail world is not your calling.