good with my judgment. only 2 grandbabies but 3 younger sibs and have cared for hundreds of kids in my 58 years. I would done same. as long as you explained something about not doing something mean in anger, so the point was not lost. an 8-year-old darned well has a clue he is being mean. crappy parents to not have leaped on this immediately. unpunished, this kind of behavior tends to get worse in my experience. good luck