The "Customer is always right" mantra can lead to disaffected employees. Support your employees, and not those customers that are bad for your business.
One woman who frequently flew on Southwest, was constantly disappointed with every aspect of the company’s operation. In fact, she became known as the “Pen Pal” because after every flight she wrote in with a complaint. She didn’t like the fact that the company didn’t assign seats; she didn’t like the absence of a first-class section; she didn’t like not having a meal in flight; she didn’t like Southwest’s boarding procedure; she didn’t like the flight attendants’ sporty uniforms and the casual atmosphere. Her last letter, reciting a litany of complaints, momentarily stumped Southwest’s customer relations people. They bumped it up to Herb’s [Kelleher, CEO of Southwest] desk, with a note: ‘This one’s yours.’ In sixty seconds, Kelleher wrote back and said, ‘Dear Mrs. Crabapple, We will miss you. Love, Herb.'”