Okay, but just blocking content isn't much better than being unengaged, in the long term. They will get exposed anyway, if only from a friend (whose parents are unengaged and lazy) who has no restrictions on their phone. The important thing is to teach and train media skills. Teaching an understanding that comment sections are cesspools and amplify negative feedback. Teaching that people flame because it's so much easier than keeping silent, or putting in the thought to say something useful. Teaching that there are truly horrendous things on the Internet.