In today’s current climate, I would say NO to anything physical. I wish they would also look at the mental abuse.
When I was in elementary school, I had a teacher who would make up halacha and then taunt me with it. It took me four years of high school, learning a lot about halacha and how varied many psak halachas are to understand why she was really a sham.
Just because they are a teacher in a Jewish school, does not make them a proper teacher. So unlike in the times of the gemara, where a teacher had the best intentions, I think it would be considered physical abuse and I would bring every weapon at my disposal (including alerting local authorities) to punish the person at hand.