Don't be doing that. Don't start hating your customers. It is bad for you and bad for business. They are your bread and butter so start liking them again and make life more enjoyable. It's not them. If it is? Get a different job. You need to have peace of mind.
Too late. I already hate many of them, or more correctly, hate the things they do to make my work day more nettlesome. Yes it is them. And the "get a different job" is just fatuous. This is not so easily done and the same crappy customers infest any workplace.
I have read several occupational surveys and discovered food service workers have the second highest level of occupational related depression and the first highest level of alcohol and drug use.