I'm not an expert, and of course such an inflammatory historical narrative is going to have disagreement, but the evidence pretty strongly suggests that mass-rape took place during the occupation and invasion of Germany proper.

https://en.m.wikipedia.org/wiki/Rape_during_the_occupation_of_Germany

Now that MIGHT not rise to the level of genocide, but it sure as shit ain't the action of benevolent liberators either. One could see how virulent dehumanization might lead to a greater rate of war-time rape.