How the average antizionist thinks Judaism works:
* Judaism is exactly like Christianity and Islam - a multi-ethnic religion that anyone and everyone could join very easily throughout history.
* Therefore, most Jews nowadays must be the descendants of converts, just like most Christians and Muslims.
* Like Christianity and Islam, Judaism has holy sites in places like Jerusalem, but beyond that, as a global religion, it doesn't have any special connection to the land.
* Judaism's relationship to Hebrew is the same as Christianity's relationship to Greek and Latin.
* Ashkenazim = privileged White Jews.
* Mizrahim = oppressed Brown Arab Jews.
* Sephardim = don't fit the paradigm, probably don't exist.
* Palestinian Jews = not merely Jews who lived historically in the region of Palestine, but rather people who were ethnically Arab and religiously Jewish. Equivalent to the Christian and Muslim Arabs who lived in the region.
* Zionist Jews = fringe extremists who are equivalent to fundamentalist Christians or Islamists.
* Neturei Karta/JVP = totally mainstream positions within Jewish communities. Can legitimately be called "the real Jews" in contrast to the evil, bloodthirsty Zionists.
* Holocaust survivors = mostly went to the US or other countries, probably. Didn't have any special desire to emigrate to Israel (and why would they, seeing as Judaism is a global religion with no specific connection to the land?). The default assumption is that most are against Israel.
A lot of this is based on knowing nothing about Judaism and filling in the blanks by assuming a modern Christian and/or Muslim mindset.
When you take all this into account, it's easier to understand a lot of their nonsensical talking points, like "Jesus was a Palestinian," or "Jews shouldn't pray in Hebrew because it might offend Palestinians", or "I should be able to convert to Judaism without the problematic Zionist parts of the religion."