It doesn’t matter if there are dozens of ethnic minority groups in a country. When it comes to justifying the worst evil, they all get lumped into “whites” and “Asians” or “blacks”
Just as it has been for centuries. Race “scientists” usually divide humanity in to three overall races. “Caucusoids” and two other “-oids” based on the Mongols and the n word.
An important thing to raise here is that the minority don’t just live in the countries, they also get equal rights. Zionists flip-flop between wanting Israel to be an ethnostate where the minorities should be killed/removed and an apartheid state with Palestinians as an eternal underclass.
It was actually a controversial dilemma among early Zionists in the Yishuv since many understood that things would get permanently more complicated if Arabs are even "permitted" as an underclass, as their planned Jewish state will eventually come to rely on them as an exploitable labor force among other things. It's the same way that the South African government trying to "separate an omelette" with Apartheid, as the last President before its dismantlement pointed out.
If Japan started treating it's Ainu, Ryukyu, Korean, or Chinese minority as bad as Israel treats palestinians then they would've been nuked again by now. Clearly, the only way for Israel to be a proper ethnostate is to give the Arab countries and Iran nukes.