Uh, cyberwar? No. This happened once to my one of my sons. I found out who the parents where (divorced, different locations) drove to both their houses, and said, "If your kid doesn't stop today, you, your kid and your family, are not safe outside this door. I never said this." I put on my best pycho face. Truly, I was psycho, so it didn't take much.
It stopped.
I was the target of intense intense bullying as a kid. Affected me my whole life until my 30's. No kids of mine was going through that.