I agree with not just encouraging passivity and avoidance.
At the same time, I don't think it's out of place as a provider to ask what form the bullying is taking place, and help patients identify ways to set appropriate interpersonal boundaries, which might include cyber stuff.
Here's an example for you.
Every year I go to see my family for the holidays, and they interrogate me at the dinner table about what a failure I am in life (MD doesn't count for much in this hyper-successful keep up with the Jones' type), until I came to jokingly say "It's Christmas. Time for the annual make-Crayola-cry-at-the-dinner-table dinner!"
One year was particularly hard, and I was really dreading it. I mentioned this to a psychiatrist who said, "Has it ever occurred to you that you can set boundaries, even with family?" I was like,

They were like, "Next time, just say, "I'd rather not discuss that." It sounds rather daft to say that had never occurred to me.
So I don't think it's out of bounds to ask if parents/kids have considered setting boundaries like that when it comes to cyber-bullying, at the least. Sometimes disengaging is active.