Karate Doll

This is what my 10 year old boy said to me..?

He knows chris brown and he knows Rihanna.. He was in his room making karate chops on his sister doll toy and when i walked he i asked, what are you doing? He said beating up the girl like chris brown said its ok because chris and rihanna are back again so its Ok to hit people…What should i tell him that this is not right?

its OK for Rihanna

karate BARBIE doll