I did my PPL at the RVAC at Moorabbin in the mid 60's, possibly the busiest years ever for GA. Everybody there yelled at the students , instructors, reception staff, fuel guy, ATC, engineers
Had a completely different experience latter half of 1966, Roy Goon CFI, personal instructor Clem Atkins, top notch, couldn't have been better.
One instructor at another Moorabbin school advised his student to give it up as he didn't have what it took to be a pilot, boss dressed the instructor down for giving the advice as he saw the student as a source of income.
Even in the military there were at times a clash of personalities, or what ever you want to call it for the two not to gel, not completely unknown for a student in pre wings training to go to the boss and ask for a different instructor, and for the boss to be sympathetic and arrange a swap. Don't ask you don't get.