Yesterday I got a message from a parent (well off, because her kid goes to a private school and she owns some stables) who had previously contacted me in October, asked me lots of questions and then disappeared. So I told her that as she had previously wasted my time I was not prepared to tutor her son. From the reply I got today, she was absolutely furious. She told me that I was arrogant, there were lots of other tutors, and that I could stick my tutoring. It was very satisfying to see how annoyed this uppity parent was to find someone who wasn't prepared to tolerate being messed around. Putting people with a sense of entitlement in their place gives me that nice warm feeling.