Son is suspended

My son just got a week long suspension from school. My son is in the 8th grade and my daughter is the 7th. At the school they do this thing called slap ass Tuesday, where everyone slaps each other's asses with or without consent. My kids no not to participate in shit like that. Even though it's Monday some of the boys and girls were doing it. This one 8th grade boy kept slapping my daughters ass. She told him to stop several times and went to tell the teacher. They didn't do anything. The fact that the school doesn't punish the students for making a day out of it says a lot. My daughters friends thought it was funny. She was going to ask her brother for a dollar and the boy went and slapped her ass really hard and told him to stop again and started crying, so my son went up to him and punched him in the face. They are suspending my son for a week but that little pervert is just getting a lecture about why it's wrong. They let this little boys and girls run around slapping the other asses and without consent and they get no punishment besides a talking to, but my son defends his little sister after she repeatedly asked that boy to stop and even told teachers and he gets suspended. Okay. So we are raising a punch of future sex offenders!