I suffered abuse as a child from teachers. Once I once commented in therapy that if I had access to an iPhone back then I wouldn’t be worried about some issues I was having at work, and the therapist agreed.
Sadly based on my readings of places like Reddit that skew younger + convos with peers, I think that the abuse has mostly just scaled itself back.
Stuff like the above is rare, but the “what are you going to do, sue me?” mentality prevails. The ACLU et al. will get involved if the behavior is egregious, but a lot of toxic behavior goes unchecked because it’s not egregious enough for a lawyer to take the case on contingency (to agree to be paid out of the winnings), especially if it doesn’t touch on speech, gender expression, or religion and is just generic assholery.
Sadly, someone is lawful evil enough to be mindful of what they can get away with, not what is not allowed, there’s a lot of room in our school systems for shitty behavior.
The silver lining is that Columbine still has everyone scared enough that outright physical stuff like the above is super rare 
