how would you describe Rogan’s behaviour and the fact that this particular act had zero impact on Rogan’s popularity?

It’s absolutely concerning. Rogan, aware or not, is promoting fasist propaganda and revisionism.

The alt-right influence online has played, and continues to, normalize this kind of fascism for many people in the US. The systematic erosion of the education system in America, not just higher but all the way to elementary, has played a major role in this. Not for Joe, that may be the WWE lol, but certainly for the audience. The atomization of people also play a big role IMO. People have far fewer friends and groups IRL nowadays. I think that is absolutely making parasocial relationships, like with podcasters (or any other online personality) far more common than it would be otherwise.