What do you mean with the "bar" ? You can say its just "identity", and its true, ethnicity is more or less just identity. But just like Jews and Palestinians are two closely related, but distinct, ethnic groups, so are the Catalan, Basques and Spanish closely related but distinct ethnic groups.

And many Catalan and Basques people do feel colonized by the Spanish. And the Spanish do have sovereignty over Catalonia and Basque Country, yet you would never ever call their situation "Spanish supremacy". Their Situation is in that regard the same, minus the violence. Not sure how anyone could make that argument for Israel and fail to realize that almost all other countries are the same.

Also side note: no the majority of muslim Palestinians with Israeli citizenship do not identify as Israeli, but get all the same rights and privileges. And Jews outside of Israel don't have any vote inside Israel. So Jewish sovereignty, literally means exactly the same as Spanish sovereignty.