What do modern Nazis get wrong about Hitler's Nazism?
Today's neo Nazis consistently frame their ideology around white supremacy or white racial solidarity. However, my understanding is that Hitler's Nazism specifically considered Nordic/Germanic people to be the master race, while considering Poles, Slavs, Romani, and others as racially inferior, even though many of these groups would be classified as white. I specifically remember reading about how Slavs were marked for extermination just like other groups. But people with Slavic or Polish backgrounds would have no problem joining a modern Nazi movement.
Are there any other aspects of Nazi ideology that modern neo-Nazi groups get wrong or fundamentally misunderstand?