I wouldn't say it's an emergence of a general dislike of each other. It was desegregation; the dislike always existed, but before Brown vs Board of Ed and other decisions in the same cities different racial groups lived in different worlds.
Blockbusting was a real phenomenon in which real estate agents would move a black family into the neighborhood to get white families to fire sell their homes, and it worked because they could no longer legally isolate minorities from their children. https://en.wikipedia.org/wiki/Blockbusting
We know that this happens today, even with minority groups that are affluent and do well in education metrics. https://slate.com/human-interest/2015/07/silicon-valley-whit... (And before anyone accuses me of "wokism", the original story was broken by the Wall Street Journal, which is decidedly not a "woke" publication.)
Blockbusting was a real phenomenon in which real estate agents would move a black family into the neighborhood to get white families to fire sell their homes, and it worked because they could no longer legally isolate minorities from their children. https://en.wikipedia.org/wiki/Blockbusting
We know that this happens today, even with minority groups that are affluent and do well in education metrics. https://slate.com/human-interest/2015/07/silicon-valley-whit... (And before anyone accuses me of "wokism", the original story was broken by the Wall Street Journal, which is decidedly not a "woke" publication.)