No, I don’t think they meant the kids should have known better, but rather the adults should have known to keep them away from social media because it’s the ultimate cyber predator.

God knows what a hyper-specific ML model is going to do for them

Idealistically I'd say their millennial parents failed them for having that ignorance to begin with, so yes they should know better.

Realistically, you're not wrong in your rebuttal.