How bro sound:

First, they’re talking about the need to kill Zionist kids. (As an aside: WTF? Kids?) But it doesn’t make much sense to talk about Zionist babies any more than Communist babies or fascist babies. They care about milk and wet diapers, not class warfare or territorial conflicts. Babies don’t have political ideologies; they aren’t born with them and don’t automatically inherit the affiliation of their parents. They CAN be born with a preexisting identity of some racial, national, or ethnic group … like Jewishness. They’re talking about Zionists as an ethnic identity, and also assuming babies have some inborn (lesser) value determined by their descent, which is racist, even by a conservative definition of racism.

Then they’re talking about the concentration camps. Aside from the weirdness of talking about the Holocaust as a lesson that needed to be learned by its victims, the Holocaust was not some kind of action against Zionists, or Zionist Jews, but simply Jews. They targeted that ethnicity. Nazi persecution targeted Jews regardless of political affiliation. It’s not like they left Jews alone if they weren’t Zionist. Zionist Jew, Bundist Jew, Jew who didn’t get involved in politics and minded his own business, to Nazis a Jew is a Jew is a Jew and if you’re in German territory, then die. Nazis did not target Zionists, but ethnic Jews. Again, they are talking as if they are talking about an ethnic identity, not a political viewpoint.

(Aside: What is the unspecified lesson Zionists should learn from the Holocaust? What does this person think the lesson of the Holocaust is?)

This person never actually said “Jew,” they said Zionist, but they seem to be talking about Jews, which they call Zionists. They're obviously viewing their enemies as some immutable national / ethnic group. This person is not angry at some political movement or worldview or personal actions, they’re angry at an ethnicity. An ethnicity persecuted by Nazis. They’re angry at Jews. This person isn’t telling us an important critique of the Israeli government or war. This person is telling us they hate Jews and think the Nazis were right.

Sadly, there are tons of other posts that are less theatrically bloodthirsty that probably never consciously register with people. I see posts like “Zionists control the media” which is exactly the same old “Jews control the media” claim but they changed one word. I have no doubt that they flew across the screen of plenty of people who considered themselves kind, just, and tolerant, and saw the word “Zionist” and thought “Well they said Zionist not Jew, this is antizionist, not antisemitic” and did not really think “What is this guy actually saying?” I mean yeah, they said Zionist, but they meant Jew. There are a lot of people who do that, and can be pretty openly antisemitic as long as they just don’t say “Jew.” People need to learn this and notice this.

It doesn't have to say "The Jews." Think about what the person is actually saying.