South Carolina law addresses bullying, but leaves it up to the schools to figure out what the punishment for bullying should be.  So, even though the law says that students cannot bully other students, it is up to the school to do something about it. 

In answer to your question, it is not a crime to bully another student, but a bully will get into trouble at school. 

S.C. Code Sections 59-63-130 and 59-63-140.