When i was in school I was sent down to younger classes countless times, pulled up the steps by my hair to the principal, sent to do work in the library, suspended, had to write essays, missed recess etc. You name it! No, I am not off the derech or messed up; those are choices that someone makes. I think blaming a teacher who sent a kid down a class and now is off the derech is extreme and disgusting.
Secondly, to call a highly respected Rosh Yeshiva that you never met a clown is….!!!