Back home, you could probably cuff and slap on the cheek those kids who misbehave in order to teach them a lesson about respecting adults, and their parents would totally support you and punish them for disrespecting another adult.

Are you joking. I can tell you from long experience(but just read the newspapers) that British universities are safe, as are private and public schools. State schools are unsafe and if you are a teacher you can easily get stabbed to death by a pupil. Parents of the lower orders are as common as muck and will side with their moronic offspring. There's a good chance you will be beaten up by a parent. None of this will happen in China.