Interesting article and I think it really highlights how toxic some parts of the Internet are. My only issue is the conclusion,
A social media ban for under-16s might prevent young boys seeing endless content that treats women with contempt and hate. Boys at this age are very susceptible to the cool and funny framing of what is, in reality, relentless misogyny. A ban might not fix the problem, but it would help. If society can’t stop it, it can show it disapproves.
Emphasis mine. Having grown up in a different era I can confirm that boys of a wide variety of ages, including much older "boys", can also be scumbags. Even if we had the perfect technology to ban under-16s from social media, once they hit 16 they'd still be exposed to it, still become terrible people, and the author of this article, although a but older, would still see it. I don't know if that really is a better world, just a slightly delayed one.
I don't know the solution, but I remember reading once that some online game would put all the reported and abusive players into a special category where they would be forced to play only with each other. Maybe we can do that in this case.