Revisionist history
In actual history, Hitler admired and even congratulated the achievements of the black athletes at the olympics. But the makers of this movie won't mention this at all because it's inconvenient to them. Before the release of the first trailer of said movie, they tried censoring the article about Jesse Owens too:
Here is the internet archive mirror to see for yourself that they removed Hitler shaking hands and the stuff about the hotels right before the trailer: https://web.archive.org/web/*/https://en.wikipedia.org/wiki/Jesse_Owens#Berlin_Olympicshttps://web.archive.org/web/20150509141845/http://en.wikipedia.org/wiki/Jesse_Owens