All my jaydub experience is in the San Francisco Bay Area of the US. Interracial marriages barely raised a ripple - in fact there were at least a couple in every congregation I was in.
One white brother who grew up in the South - Texas I think - told me, when he was considering marrying a black sister, that his father had trouble accepting it. He was proud that his father finally overcame his prejudice, especially since Dad had been a Ku Klux Klansman before he came into "the truth."
OTOH, I remember my husband telling me some racist remarks he overheard some (non-white) friends of ours making, when their marriage fell on troubled times. Nobody's perfect -
But on the whole, as a white person living in a fairly liberal part of the world, I got the impression that casual un-racism was something the jaydubs did fairly well.
gently feral