Bingo.

The customer is always right!

Some of the worst managers (and coworkers, and customers) are people who take this literally and without criticism. The phrase is a handy way to express that customer service is important, and the customer should be given the benefit of the doubt whenever possible.

That’s fine. However, it does not mean that a person turns into an infallible god upon becoming the customer of a business. The only people I’ve ever seen take it 100% seriously are customers who know they’re wrong, and managers who are too lazy to do their jobs.