What these normie-networks did do was make a UX for public posting so easy that scores of low-education users were able to be influenced and re-share low-infromation-quality stuff in huge magnitudes. FB is guilty of making a super accessible user experience, and then in not being aggressive early enough in having high standards for its userbase. But it didn't invent society's ills.
The influx of normies circa 2000 did not seem so bad to me but Facebook and Twitter were another thing.
Let me repeat him as you probably didnt catch it (I dont understand how, but this is one of the things, I dont understand, so I wont argue about it):
“Social media gives legions of idiots the right to speak when they once only spoke at a bar after a glass of wine, without harming the community ... but now they have the same right to speak as a Nobel Prize winner. It's the invasion of the idiots”
I can just confirm that what he has seen and described is correct. And the more that you are standing your ground, the more you are proving, he was correct.