The implication is that someone is going to come off as a likely mark and for example get invited into a private user group with people “joking” with things like the Happy Merchant or being ridiculously over the top in a way that’s hard to take seriously to ease people in to taking white supremacist ideas seriously.

Ever seen the South Park episode about the Passion of the Christ (https://en.wikipedia.org/wiki/The_Passion_of_the_Jew)? The idea is basically that that is constantly happening online anywhere it’s not sufficiently prevented.