I think it's a phase, I went through it when I was young, too. Freaking out and then blaming others when I poked my nose in, lol. To be honest, the internet is a wild place for kids and I think parents have forgotten how to teach internet and media safety to them, and kids lash out trying to make sense of it and gain control. But even then, they'll go look the stuff up anyway (I was reading fanfic I shouldn't have been, then going on rants).
Easier to just block and move on. But I feel you, it's frustrating.