I fired a teacher after three lessons, after she had suggested me to increase my handspan and touch by putting Champaign korks between my fingers. No joke.
I think the same thing for anything that shows a deeply-rooted misbelief about the act of playing. If I can discern it, they are not the right teacher for me, if I can't discern it, I probably still have something to learn from this teacher.
I effectively dumped my first piano teacher I had when I was 8. She was a boring old granny person, with a cat that I was allergic to, and I never practiced because I found Suzuki boring as well.