Is it still socially and by the rules acceptable to to yell at kids and leve brusis on them if there male.

I give some context when I was little I was sent to the time out room a lot and went home with brusis even one of the teachers sate on me and I could not breath she was a big lady and when I was younger the teachers would twist my arm and throw our push me in the time out room I went home with a lot of marks on my body and when ever I would cry they would scream at me and get angry from what I was told this is considered child abuse by the school system and the law I'm thirty so this happened years ago so I wonder if things changed our is this still acceptable if it means controlling the male kids. for the female kids the teachers would ask what was wrong and use less force is this still going on in the school system?

Ps I got the brusis from the teachers not from playing