The Anti-Zionism Fallacy

First of all, because it apparently needs to be said, non-Jews have no established authority when it comes to policing the boundaries of antisemitism. 

And when they do start up with this, they only end up sounding like Elon Musk lecturing black people on the permissible uses of the term 'racism'. (Or indeed, worse, Musk appropriating minority black voices in order to do this.)

Secondly, I shall resort to a simple analogy to make the key point here...

As a non-Scottish Brit I am aware that there are aspects of the Scottish Nationalist programme which I do not favour (specifically the call for full independence), but I am also aware that I have an obligation to express these opinions in a manner which doesn't make me appear to be a total prick. 

The same is clearly also true of any bona fide Scot who might feel the same way. 

Stating that I am engaged in a fanatical fight against all forms of Scottish national aspiration, demeaning Scots, or perhaps stating that they all originated in Ireland, or similar, would certainly be a fast track to prickishness.

Nobody, no matter which identity or group with which they habitually align, has a fundamental right to oppose another human group's aspirations to nationhood. One can take issue with policy, with attitude even, but not the basic impulse. For that is bigotry.

Most of the above applies to non-Arab 'anti-zionism'. The Arab form is instead more often a kind of negative image of the typical aspiration to nationhood: a dogmatic anti-nationalism targeting Jews rather than any serious attempt to build a coherent and viable vision for Arab Palestinians. 

I have certain hard red lines when it comes to antisemtism, so when self-professed 'anti-zionists' cross them without shame, I am not interested in any subsequent bleatings about how their chosen cover story gives them a free pass. 

Whatever anti-zionism might be in the abstract, their version of it is Jew hate. This includes demonising Jewish nationalism, or juxtaposing it with Nazi iconography, to state the rather obvious.