What is the ratio of kind customers vs. horrific customers you deal with? The truth is that you are going to deal with terrible people, but it's you're perspective that truly matters. I am sure you also get to work with some wonderful clients as well. Think about the most positive feedback you've gotten, and hold onto that and don't let some psycho bring you down. Few people follow through with reporting people to their supervisors, and the types that do usually end up sounding just as irrational and crazy to the supervisor as they did to to you.