You should listen, and then talk to your child about the value of respecting themselves and others. If bullying continues, consistent consequences are necessary. If your child doesn't respond to consequences, then you have to start looking at alternatives. They need to know you're paying attention and are willing to stay on them about their behavior.
What do you want the panelists to weigh in on? Email your ideas to editor Tamara O'Shaughnessy at firstname.lastname@example.org.