Bullying is not a new phenomenon. It has been around since the beginning of civilization. Those that feel less than competent or valued take their frustrations and pain out on the people around them. Usually, the bully looks for those that appear weak or vulnerable.
https://bullyproofkids.org/how-to-stop-my-kid-from-being-bullied/
https://bullyproofkids.org/how-to-stop-my-kid-from-being-bullied/