Orange County didn't flip just because wealthy white voters crossed over, it flipped because the northern and less wealthy part of the county went Democratic in a big way. Places like Westminster, Garden Grove and Fountain Valley had huge swings that suggest that the Asian vote shifted heavily away from Republicans. Democrats also picked up an Assembly seat and a State Senate seat in Orange County, while the Republican registration edge is down to less than 3% and dropping. This isn't an anomaly, it's something that has been happening for a long time and Trump just sped it up.
Winner winner chicken dinner