Well German newspapers certainly.
Given that there were apparently a whole 66 cases reported to the authorities, the general public doesn’t seem to have cared that much.
Then you look at Appendix IX which reports on an “American” meeting ostensibly held to talk about the outrage of black troops being used in occupation which turns out to have one German speaker on the panel and the audience is only really miffed at the French and Americans in general rather than black troops specifically.
The impression I get is that while Germany and Germans certainly were horrendously racist and resented the defeat and occupation, the fixation with black people is a specifically American thing which fell flat as far as propaganda in Germany went.
Germans of course being much more fixated on Jews and Poles, etc.
There was a staggering amount of propaganda going on before, during and after the First World War, from all sorts of groups, much of which is fairly hard to get a decent overview of (at least for me).
Project Gutenberg is quite useful in that respect, for example there’s a book on there with a title which just begs for 1980’s comedian crap jokes - “Brave Belgians”.
It’s a collection of tales of derring-do and bravery by Belgians in the First World War and contains a surprising (to me at least) number of secret agents and commando-style raids for a war which we’re habituated to thinking of as a bunch of guys in trenches shelling each other for weeks before hopping over the top for a slow stroll into machine gun fire.
All of which takes us rather off topic - which is to say that the idea that Hitler could possibly have come to power with any agenda which would not have required him to take measures outside “Germany” (however you choose to define Germany) is, as several people have pointed out, complete nonsense and the idea that everything would have been fine (for Hitler) as long as he just stuck to murdering people in Germany is… well, probably honest.
It would be nice to think the rest of the world would have got involved if Germany hadn’t invaded other countries but history doesn’t seem to back that up.
Of course quite how he could have embarked on a process of murdering millions of people within Germany without at some point having to invade a neighbouring country is an exercise in economics and geography that seems to me to involve magical thinking.