If you haven't seen the Seinfeld soup nazi episode you've probably heard about it. The patrons put up with the abuses of the owner because they liked his soup so much. I suspect that the episode must be based on a real restaurant in New York City. But most of us have experienced places like that.
There is a fast food Middle Eastern place near my office where I will go sometimes which sells falafel wraps. The fellow who takes your order is humorless almost (or maybe not even almost) to the point of being rude. He hates it when you order something to go and then actually insist on getting the paper cup for your drink. And, of course, you'd better pay quickly. I will go there when I actually happen to be in the office and am not up for the cafeteria. But if I have time I prefer the shop a couple of miles further away which is much more friendly and sells a proper falafel on pita bread.
There is an Indian restaurant in Morgan Hill Terry and I enjoy. They have a buffet and it works out nicely to meet her there after church for lunch. There used to be a young guy there who was very friendly. Recently it's been staffed by a middle-aged (I should talk) fellow who is not the most friendly. One Sunday we were the first to arrive and he had to turn on the lights and bring out the food so we could eat. His body language and demeanor were such that Terry whispered to me, "Well excuse us for wanting to have lunch!" At least on our last visit the cook, a very nice Sikh gentleman who has been there for a very long time, gave us a smile and thanked us as we left.
Bur really, a little friendliness couldn't hurt, could it?