I only dabble in music as a hobby, started later in life, never had any professional instruction whatsoever. So occasionally I find myself on forums populated in part by people who have been taking formal music lessons from strict teachers since the age of three and OH BOY do they get fired up when someone suggests anything that differs even slightly from their training.

There is definitely some subset of musicians that cannot conceive the notion that someone somewhere on the planet might be learning music just for fun and don't WANT to take it uber-seriously.