This perpetuates the myth that "real" bullying is physical and that psychological abuse is not bullying. Most of the bullying i've seen was psychological and partially material (usually taking things from the target or damaging them).

The only instances where i've seen physical bullying were in low grades where the children had not yet developed the mental capacity for creative verbal abuse or in higher grades where bullying was left unchecked for so long that the aggressors felt confident they could get away with it.