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A friend (actually, current gf, to be explicit) had this with a guy she dated -- Indian, not Asian, but similar reasons for secrecy (in his case, not ageism and racism, just racism.) More commonly, I'd imagine, it's the black person joining a white family.
I disagree that you should give him a pass (or even a temporary pass) because he's "going along with his culture." Respect of this basic a form is transcultural, it's not like which fork you eat the fish with.