Bullying is often about power, and a child who bullies is often trying to counteract something that’s going wrong (real or perceived) in his own life. “In fact, there’s a strong case to be made that a bully is typically smaller,” Mayer says, adding that the aggression could be inspired by the bully’s lack of confidence and feelings of physical inadequacy. “Bullying is mostly psychological,” Williams says. Girls report being bullied more than boys — and they’re more often victimized by passive aggressive behavior or social aggression over physical harm.
Source: Great Kids!