When i was going to primary school back in the late 1960's, I had a Female teacher smash me into the desk for not being able to understand long division. It completely shut me down emotionally as i was a child and the brain turns off. It's not that I didn't understand, it's just that the fear of suffering abuse stopped me totally from functioning and as a result the abuse got worse as my maths got worse.
I don't think I was alone as other children had dusters thrown at them with their heads as targets, I formed a long friendship with someone in the same boat. All the teachers that did the stuff are dead now.
But it had a profound effect upon my trust in human beings in power of position.