Orange County’s mythos is so well-known among our type of people that it’s not an oddity, but in a vacuum you’d expect a 63% nonwhite county with a significant college-educated white population that’s also the major suburb of LA to be more of a blowout for Dems than it is.
To be fair, a significant portion of OC's nonwhite population is Vietnamese, and this is the one Asian ethnic group that is R-leaning (due to the political leanings of their ancestral homeland, although younger generations tend to be more D-leaning).