The problem is at least in Germany that the nuance is literally banned by the government. Demonstrations in support of the Palestinian victims of Israels attacks and blockade are getting banned in fear of antisemitism. Educational entities proclaim that criticism of the shape of the Israeli state are considered antisemitism as much as demands to give back the land of the displaced Palestinians, as these are considered "attacks on the existential right of Israel".

I tried to find that term and it doesn't seem to exist in the english languaged discourse. Also i couldn't find anything that actually gives specific states a specific right to exist. People have the right to exist and be sovereign, but this is not tied to any specific state. And from my understanding the sovereignity of one people cannot be used as a reason to take away the sovereignity of another people.

The people who proudly claim themselves "anti-zionist" IRL are almost always anti-semites if you scratch the surface. Not because anti-zionism is inherently so, but because the term has become a dog-whistle for "I watched too many conspiracy youtube videos".

Also it's a weirdly religiously charged word to use; we don't use a specific word for Russia's goals for Ukraine or China's goals for Tibet or Taiwan. So of course the use of a religiously charged word begets accusations of religious persecution.

"I am against Israel's apartheid state and illegal colonization of the West Bank" -> perfectly sane take
"I am anti-zionist" -> oh my god what kind of cookadoodledoo rant is this motherfucker about to get into

So yeah, I'd stay clear of "zionism" as a concept entirely. While it is an integral part of the history of Israel, it is not necessary to understand that to criticize Israel's actions in the 21st century. And if you're going to pull put the "but the zionists" card, you better know about domestic Israeli politics a lot better than I do (which if you don't have a reasonable reason to do so like being Israeli, is again a red flag for an obsession with "the jews").