What is a "Palestinian Citizen"?

I spotted this and it piqued my curiosity:

In the past, we would have read "Israeli Arabs demonstrate...".

They are not "Arabs" but "Palestinians".

Their nationality, even if born in Israel, is not Israeli.

If you check here, you'll learn that

There has never been a sovereign Palestinian authority to explicitly define who is a Palestinian, but the term evolved from a geographic description of citizenship to a description of geographic citizenship with an Arab ethnicity.

But if you go back a few lines there, you'll have to wade through some gobbledygook:

Palestinian people have a history that is often linked to the history of the Arab Nation, which is linked to the rise of Islam. When Islam was started by Muhammad in Mecca in AD 610, Christianity was the major religion of Palestine. Soon after the rise of Islam, Palestine was conquered and brought into the rapidly expanding Islamic empire...After toppling the Mamluk state in 1517, the Ottoman Turks took control of most of the Arab world. Palestine existed within the Ottoman Empire as two districts, also referred to as Sanjaks. The legal origin of citizenship in the Middle East was born of the Ottoman Citizenship Law of 19 January 1869...

So, there's a fictitious nationality based on a fictitious people in a fictitious country.

The Muslim Arabs conquered the Land of Israel that had been conquered by the Romans whose empire then became the Byzantine Christian Empire. It wasn't a country but just to districts.

But it gets better:

The Palestinian National Authority drafted, but did not pass, a piece of legislation in 1995 outlining its Citizenship Law. Article 7 of this legislation defines a Palestinian as anyone who "(1) was a holder of Palestinian citizenship (other than Jews) before 15 May 1948; (2) was born to a Palestinian father; (3) was born in Palestine to a Palestinian mother even if the citizenship of the father is not known; (4) was born in Palestine to unknown parents;...

So, to be "Palestinian" is not only a fiction but a racist status.

And liberal/progressives support this.

^