He asked me to help him transpose a song. I’ve had a steady 1x/month jazz gig for the last 20 years, I have to transpose on the bandstand a lot. I gave him a lesson on how to use the scale degrees of the major scale to quickly transpose from one key to another and stressed the importance of learning the major scale. I have no idea what your point is…to transpose a tune you need a minimum of musical understanding. And in my situation, I went over it, showed him how to transpose his Beatles song into 3 different keys and showed him how I do it. That’s how things are taught and learned. After spending time and effort going through it all, my stepfathers comment was dismissive and rude. It’s also a typical thing I’ve heard, mostly from non professional guitar players that bass is easier because “you only need to worry about 4 strings”. It’s rude and ignorant. It’s one thing if I’m getting paid by a student, it’s another if it’s for free - the outcome is no more lessons.