Students at Lee's Summit High School say administrators have failed to stop the bullying, and the victim and his friends have been punished after they tried to defend themselves.
The attacker has been charged with aggravated battery and is being held in a juvenile detention center.
The club says the school’s principal will not allow it to advertise or fundraise like other student groups.
Teachers in a Dallas suburb who refused to take down "safe space" stickers have been absent from their school.
Clementi died by suicide in 2010 after experiencing homophobic bullying from his roommate and another college student.
The slurs were directed at the school's Gay-Straight Alliance.
The teacher, who later resigned, was told having a Pride flag in his classroom was similar to hoisting the Confederate flag.
