When US cities were white, non-white immigrants sought to assimilate with whiteness.
The idea was US is essentially a white nation but open to others as well.
The idea was that white people had the power, wealth, and good stuff. So, whiteness was the ideal, the standard. Quintessentially American. John Wayne stuff. After all, the immigrants left their own nations. And they didn't want to go to non-white nations but to white majority nations, especially America.
So, as long as whites had the numbers, prestige, and power, all non-white immigrant groups shared something in common: Respect for whiteness and wish to merge with whiteness. Whiteness lessened non-white vs non-white tensions because all non-white groups could ignore one another and move toward whiteness.
But over time in many cities, whites lost the numbers, the power, and the prestige(due to Jewish-controlled PC). So, in a city like LA, there are lots of non-white groups living alongside one another. But none of them represents something that all non-whites would want to move toward or merge with. Non-white groups once valued the movement-toward-whiteness as the process of 'Americanization', but the same cannot be said for movement-toward-non-whiteness(even though the official narrative is that 'American' is purely ideological and has nothing to do with race or even culture). (The exception is movement-toward-blackness in style and attitude but certainly not in jobs, schools, and residence.) It was once considered(and still is, albeit mutedly) prestigious for non-whites to merge with whiteness --- synonymous with becoming 'Americanized' --- , but the same cannot be said for merging with, say, Mexicans, Cambodians, Vietnamese, Hindus, and etc. Even though the official ideology says Mexican-Americanism and Vietnamese-Americanism are just as American as white-Americanism, no one really feels this way in real life. Diversity really means the desire by non-whites to be included in the White or White-made world. Diversity without whiteness would be like building a model without glue. The structure wouldn't hold together. It's been said that Diversity means 'no more whites', but that'd be self-defeating like a model set without glue. Indeed, diversity without whiteness isn't appealing to most people. Latin America and North Africa are very diverse, but neither has enough whites. India is very diverse, but Hindus prefer to move to a white nation. Most people in diverse nations with no or few whites prefer to move to white nations. Ideal Diversity requires the White Magnet. Hindus don't want to be with blacks or even with fellow Hindus. Black Africans don't want to be with Hindus or even with fellow black Africans. Both want to be with whites, and the Diversity in UK is the result of non-whites preferring whites over non-whites(even their own kind).
If an Asian-American moves to a white community, he or she feels 'Americanized'. Indeed, he or she is willing to surrender his or her own identity to take up this new prestigious ersatz-white identity. But would Chinese-Americans want to give up their identity to merge with Mexican-Americanism, Hindu-Americanism, or even Korean-Americanism? I think not.
Indeed, it's interesting that Chinese have been in Southeast Asian nations for so very long BUT they've mostly retained their Chinese identity and pride. In contrast, so many East Asians in white nations instantly surrender everything about their race, culture, and language to merge with whiteness or 'westernness'. People will surrender their culture for something higher but not for something lower. Chinese will surrender Chineseness to become 'white' or 'western'(deemed superior to Chineseness) but not to become 'Filipino' or 'Indonesian'(considered lower than Chineseness). Maybe Sephardic Jews mixed more with Muslims and Arabs because they weren't all that smarter, whereas Ashkenazi Jews in Europe, being markedly smarter, were less willing to merge with goyim. I dunno.
If Los Angeles had lots of whites, this 'fancy' Asian vs 'jungle' Asian dichotomy wouldn't matter. Both the 'fancies' and 'junglies' would focus on merging with whiteness as the American Ideal. Indeed, Asian women find it most ideal to marry white and have white-looking kids. And even in Asia, lots of Asian women get plastic surgery and dye their hair brunette or blonde to look like cartoon-white-people.
But because whiteness is becoming a more precious commodity in places like LA, the 'fancies' and 'junglies' are becoming more ghettoized in their own identities. Vanishing of whiteness means less of something for which Asians(or other non-white groups) are willing to surrender their own identities in order to merge with something higher or more quintessentially American.