That type of teaching does not work.
My 10 year old son has been in Kempo karate for 5 years. He is currently training for his black belt, which he should have by the fall.
His Sensei is very easy going, but direct with the students. he never touches them other than to show a move. He is only tough in making them do things over until they get it right.
We have been to tournaments where my son has faced students from a school with a very strict teacher. Not like this a-hole, but very strict.
My son has never lost a point sparring contest to any of those students.
I am not bragging here, as he has lost to others, but not to the extra strict type instructors students.