This should require no explanation. I offer one anyway.
One can call Israel’s current ongoing attack on Gaza genocidal; it is. One can call Kahanists and Likudniks fascists; they are. One should not call Zionism fascist because that is offensively false, but that is not wrong in the same weight class as comparing Jews specifically to Nazis.
Consider the example of The N Word. We all understand that white people must never speak it, not even in an edge case where there is obviously no malice to it — to sing along to a hip hop song, or even to say “the word ‘n███r’ is offensive”. Avoiding even unmistakably anti-racist statements using The Word is oddly arbitrary, but justified by the importance of admitting no exceptions. There are very good reasons why a white person saying The N Word reaches right into Black people and hits a deep wound, context be dammed. Using The N Word is a racist choice to say something which one knows will offend. It is an attack.
Comparing Jews to Nazis is like that, so inherently charged that any such comparison is doing antisemitism. The Nazis built murder factories out of pure hatred for us, killing off half of us, and the only thing that stopped them from killing even more of us was reducing their entire society to rubble. Comparing us to them cuts deep. Any point worth making with the comparison is better made another way.
Some may defend comparing Israelis or ‘zionists’ or particular Jewish groups or individuals to Nazis, claiming they are not saying “Jews are like Nazis”. Nope. That is the same bullshit as saying, “Golly, I was not calling all Black people n███rs”. We know better than to fall for that.
Some may defend comparing the Nakba or the ongoing genocide in Gaza to the Shoah. Nope. That is just a roundabout way of comparing Jews to the Nazis.
Some may defend comparing Israel to Nazi Germany as a relevant historical irony. Nope. Still out of bounds.
Some may defend comparisons by saying that right now opposing an ongoing genocide trumps every other concern. Nope. Not this concern.
I have real sympathy for people who are not raging bigots making these mistakes. It is unfair that the righteous and currently urgent cause of Palestinian liberation must walk through a minefield where it is genuinely difficult to make sense of what constitutes antisemitism which one must avoid. Israel hardliners disingenuously reject any criticism of Israel as “antisemitism”. Cunning antisemitic bigots coyly make their case without explicitly referencing Jews … and people who really are not talking about Jews still stumble into antisemitic narratives. Weird Jewish cults accuse other Jews of antisemitism while doing it themselves. Even sophisticated social justice advocates get tripped up by the particularity of antisemitism. Et cetera. It is weird out there.
So take comfort in this one rule being simple.
Never. Compare. Jews. To. Nazis.