Working with people

I am a bartender and a server at the Hilton Garden Inn. I am constantly working with people and while I love my job working with people is TOUGH! I just don't understand why people would be so rude and mean to me when I'm the one handling their food ;) I'm not saying that I would ever do such a thing, but they don't know that. I had one gentleman tell me that it wasn't his problem that I couldn't get his food to him on time because there was only one cook. I said well It isn't my problem either. He looked at me stunned like I just said his mother died or something. I have zero patience for rude customers. You treat others how you would like to be treated. They say the customer is always right. Bull shit not when I'm working.