It's been popularized that Nazis were going to try and ethnically cleanse the world. However that would have been in conflict with their stated ideology and actions taken. They wanted to secure a homeland for their people free of what they viewed as unwanted other groups. Outside of the planned homeland, they didn't have any stated long term plans of trying to wipe the world clean of everyone but Aryans.
They worked with the borrow the SJW term, people of colour to secure military and diplomatic goals all over the world.
It's far easier to just blindly hate a group, misrepresent their actions and ideology, than it would be to present them as a nuanced group made up of both good and evil aspects.
The biggest enemy to the Nazis were communists. A group they fought up until the US backed and armed communists were able to destroy them. At which time the US then had to fight the people they once were giving arms and equipment to. Funny how that seems to keep happening.