I think we have both been fortunate to experience and live in such vibrant and inclusive communities in this area. Yet I would challenge you about your statement that "there was no racial prejudice." I think we've been fortunate that there haven't been racially motivated acts of violence in many of these diverse cities, but there certainly are still incidents involving racial prejudice.
Perhaps you have never experienced that personally, but I know there have been many NextDoor threads in most (if not all?) of these same "diverse" cities and you will find the threads about a "suspicious" Black man who drove by the neighborhood. Embracing the idea of living in multiracial communities doesn't mean folks have abandoned racial prejudice. There's still more work to be done and anti-Black racism is still much more prevalent (in my experience) than anti-Asian racism, anti-Latinx racism, xenophobia, homophobia or transphobia.