It’s a variant of the sarcastic “that couldn’t be me”

e.g.: “Goofing off for a week and then cramming the night before the final exam? That couldn’t be me /s.” -> “Not me goofing off for a week and then cramming the night before”

I’m a huge fan of “The Alt Right Playbook”, which breaks down the dirty tactics the alt right uses to recruit people.

Also a huge fan of “In search of a flat Earth”, which looks at conspiracy theories, how they evolve, why people believe in them, and why “the shape of the Earth might actually be the least relevant part of the flat Earth conspiracy”.