AFAIK the “mongrel race” theory first surfaced in the Nazi propaganda against the Jews - the original ‘mongrel’ race. As for whether or not there’s been “a lot of genetic mixing in the [last] 2000 years”: who with? Not the Jews, duh - but not the Muslims, either, nor the Arabs, so who? The Kurds? The Turks? Canadians? Vietnamese boat people? “Mongrel race” is a racist epithet. I’m surprised to see you use it. I’m interested in any anthropological and genetic evidence supporting the ‘mongrel’ status of Palestinians, but I doubt you have it.
Maybe the Palestinians are what’s left of the Canaanites the Hebrews displaced originally, the people the Romans *didn’t* round up and kill or cart off - in which case today’s Jews/Israelis are simply invaders. Again.
I don’t hate Israel, or Jews; I sure don’t like almost all of how they behave as a nation, though - and given their history, I think their treatment of the Palestinian people is *extra*-unacceptable. From your comments, I figure you feel somewhat the same. I have no reason to think you have Nazi tendencies, which is why I was surprised by your reference to race-mixing. I commented because I figured you *didn’t* know. Thought you’d want to.