Remember elementary school? Taunts? Badgering? Bullying? Were they true? No. But they made you defensive and that made you look weak. What happened to them when you stopped responding to them? They went away. Their power over you was diffused and dissipated. Poof. Don’t give into bullying.
Also, join with others, other parents and groups, to make sure that there is a zero tolerance policy for bullying in your schools and other local institutions.