4Chan is an early adopter of memes. Unpopular memes tend to go through 4Chan and fizzle. Popular ones go through 4chan and the get big. I don't know the causal relationship.
The 👌 sign is still a white power movement sign, even if its used by youths and politicians trying to get down with the core.
I'd hazard a guess right wing superiority groups are epidemic with imposter syndrome, with Grand Wizards and Three-Percenter lieutenants doubting their validity more than eggs and questioning gays. Heck, Donald Trump, former President of the United States is like the god emperor of imposter syndrome.