I remember leaving a flying school during my initial PPL training as I was no longer prepared to pay good money to be sworn at and abused. I thought it must have been my incompetence but managed to gain my PPL followed by a CPL and eventually an ATPL which lapsed this year after I reached the ripe old age of 65. I spent many years as a TRE/ IRE with a regional airline. In my experience, with very few exceptions, the best airmen are the nicest to fly with as they have nothing to prove and the nasty ones are actually quite insecure and make themselves feel a bit better by bullying their students. Incidentally, the guy who gave me all the grief couldn't progress beyond piston twins and gave up flying whereas I ended my career on 737s, which made me chuckle!