I was reading an article about mentorship a while ago, which specifically commented on how people need to be better trained as mentors. The author was highlighting the issue of how many people who get into mentorship programs with various organizations aren’t prepared for how hard mentorship can be–that your mentee isn’t always going to do what you think is best, listen to your advice, be in a good mood, etc.
I think that’s one of the many difficult things about teaching. I tell kids that doing their homework will help them on quizzes, and they still don’t do it. I tell them to use their resources and notes, and they still throw papers away.