Similar recollections of the 70s myself, Mrs Lee in my case, though she certainly wasn’t the only one.
Humiliate the victim and terrorise the rest, neither being a positive outcome for either.
One teacher, a veteran, was indiscriminate, often “crossing the line” and everyone knew it. Yet, excused because “he was a veteran”.
I’m sure they’d claim they were teaching some lesson. The only lesson I learnt was how arbitrary “adults” can be when it comes to the rules.
I think they’d be shocked to find how clearly a 7 year old could see how they were.