Don't Say Anything you wouldn't want to be told yourself

If you want to be a good customer, stop treating people like you know how to do their job better than they do. That's not only unprofessional and inappropriate, but you wouldn't stand for that in your job. If you wouldn't want to hear it, don't say it to others.

If you're in customers service or running a company who works with customers internally or externally, don't placate bad customers by pushing aside your good customers. Nothing drives away good customers by watching you tolerate bad ones.