They aren't really echo chambers. I routinely harass these people for their racist views and they don't ban me. Their Hitler worshipping is really ludicrous. It's a lot of fun to flame someone on the Internet without worrying about getting banned for hurting people's feelings. I think the false belief that the mainstream has gotten everyone into is "racism=nationalism". The stupid people on the right bought into that and took the other side even though that's the narrative of their ideological enemies. I am trying to deprogram from the idea that nationalism and racism are synonymous.