It's not that social media has failed but rather Trent is realizing that his audience contains many antisocial malcontents and now he's recoiling in horror.
On the unfiltered internet -every- audience gets quickly dominated by antisocial malcontents.
So there's no way to infer from their presence whether they're a representative sample. I mean, people troll and spew racial slurs on -home improvement sites-. I don't think that means Whirlpool and Bob Villa themselves attract the dregs.