That was often absurd and mostly a tool used to club the anti-war left, rather than stemming from any actual concern about anti-Semitism, but I still do/did agree that ridiculosly facile comparisons to Nazis and Nazi Germany are a condemnable form of Holocaust minimization (which is just Holocaust denial), even if not everybody who makes them is evil.
You know, don't do that, it's wrong.
But the rules have changed, of course.