The caption isn't "the prevailing belief that it's okay to be a Nazi". there are influential people in politics and social media that are open about being a Nazi (or at least poorly veiled dog whistles and a general agreement with Nazi rhetoric) and being openly anti-Nazi causes harassment and being called a groomer.

"Nazis are bad" is no longer a prevailing belief. it's still the majority opinion, but now there are "discussions" about the imaginary merits of Nazism and a rapidly growing population openly identifying with the term.