why does hippos not have body hair my three-year-old man wants to know..........

he says he dsnt like school and dsnt want to go....upon inquiring, tells me that his teacher scolds him :) 
i asked him why, he said cause he fights...there is this boy who PUNCHES him and tintin punches him back...wow...welcome to schools should i say :)
i told him this morning my teachers would also scold me at school and it is as normal...so that kind of comforted him