"Protecting Freedom of Expression on the Campus"
#2. Harmful behavior suggests behavior that causes distress or injury to a person. This behavior could be in the form of physical abuse such as an attack on one's person. It could also be abusive such as a continued verbal assult.
Offensive behavior is behavior that does not inflict a "wound" such as physical or verbal abuse. Offensive behavior causes distress to one's feelings or emotions or sensibilities or morals. Offensive behavior does not cause long term damage.