Hitler's entire goal was to create a "thousand-year Reich" in which Europe (at least) would be completely dominated by a so-called "master race" of white northern Europeans, none of whose traceable ancestors were anything but northern Europeans. For the Nazis, everything was based on their desire to create that world of what they deemed superior people. And so they designated as separate races everyone who did not fit into that world in order to isolate or eliminate them. Anti-Semitism was already a common thing in Europe, though before the Nazis took over it was not yet official government policy; and Jews, who could be easily identified, isolated and thus racialized, became the primary target - although many groups who were considered other (Romani, non-white people, gay people, the disabled, as well as ideological and political opponents) also were in their crosshairs. Whether "race" is even a real thing is a whole other topic, but it's absolutely clear that racism writ large - not just racism applied to Black people, as we think of it now - was the whole point of Naziism and the cause of the Holocaust.
I don't think Whoopi Goldberg is anti-Semitic (and racism is obviously a prime example of man's inhumanity to man), but she certainly didn't get what the Holocaust was about. She is still looking at racism as a Black issue, not recognizing the essential point that the Nazis regarded Jews as a race - and, even more importantly, that the new Nazis in Trump's America still do.