The repercussion of repeated unwarranted aggressive behavior of a child is highly damaging. The instant gratification and a pseudo sense of superiority, authority & pride leaves ever lasting impact on the mind of child. This disgraceful act of foolishness and whimsical thinking needs to be nipped in bud before it develops into an attachment to one's false image of dominance, the negative energy of fear sometimes turning violent seeking attention & respect from others.  There is no harm in confronting the child then and there making him/her understand as to what is wrong with ill treatment of peers.