Dc karate class (all 3 yr olds so not exactly serious more socialising, balance & exercise), the teacher is very nice, however, a few times when a child has been acting up or not listening, he lifts a jokey fist clench to the child like he's ready to punch them!
I've not said anything although I know it's a joke to him but obviously don't think it's appropriate. The children seem to think it's funny, doubt if any of them have been victims of violence at home. All other parents (4-8 children in class) are watching on the sidelines.
So, wise MNers, how would you approach this should it happen again? He's a nice guy and been teaching for 18 years, maybe used to teaching older kids if that matters. I'm expecting responses from, 'meh, as long as he doesn't follow through' (more or less what DH said), to 'call the police & get him struck off'. 