Your child comes home from school quieter than usual. When you ask about their day, they shrug and say someone was being mean to them. Maybe a classmate made a joke at their expense, a friend excluded them from a game, or a group of kids laughed when they walked by. You want to help, but you're not sure what you're dealing with. Was it an ordinary disagreement? Were the kids just teasing each other? Or is something more serious happening?