Germans unlike Americans never enslaved black people (because Germans never had a historical path that necessitated them doing this, they were not part of the triangular trade, etc).

That said, to imagine the Nazis were not anti-black is just as ludicrous. Blacks were considered the lowest on the racial hierarchy, maybe even Jews were higher due to their intelligence. There is tons of racist propaganda that was anti-black produced by the Third Reich.

Yes Jesse Owens was treated fair in Germany....Because treating athletes badly because of colour would have produced an outrage during the Olympics. They even removed signs that were anti-Jewish during this event.

Jesse Owens and other blacks were treated fair, but basically as visitor only. And if for instance, Owens or any other black would have seduced a German woman, I can tell you the Nazis would have cracked down on this hard.

TLDR: This idea to portray Nazi Germany as some multiculti wonderland is just as ridiculous as Jews inventing the idea that Nazis made soap out of them, or shrunken heads, or skin lampshades.