Mitch Hedberg - "I play the guitar. I taught myself how to play the guitar, which was a bad decision... because I didn't know how to play it, so I was a shitty teacher. I would never have went to me."

Some people, regardless of their experience level are horrible as teachers. A school teacher gets asked the same question every year. Every year they answer them, even if it seems redundant, and the answers are simple to THEM. Teaching requires patience and the acceptance of being asked "dumb questions" repeatedly. If they cannot handle that, then they should simply not teach or pretend to be a teacher.