Restaurant Attitudes!!!!!!!!!

Why do people with customer service jobs bring attitudes and problems to work with them? They are acting as if having a job is a terrible choice, when in actuality with the economy any job is a privilege. Its not fair to the customer to have to put up with a employee's funky attitude and disposition.  I understand people have issues at home, but they shouldn't take it out on customers or their fellow employees. For example my wife and I went to an Olive Garden in Gainesville, Florida. The hostess rolled her eyes at my wife when she turned around. Honestly I was a little bit turned off by the waitresses behavior. Why was she treating us with such disgust,  we hadn't done anything to her.Of course we took our business elsewhere and laughed about this situation later, but honestly this was sad. Have you ever experienced this before?