I am an east asian gay man. Once, my boss, a mid-age straight man asked me " why asian women like to have snowy white skin(he prefers tan petite asian girls)" I answered in questioning way "why white people like to be tan?"
So think of asian gays like white, white gays like asians, my personal opinion is the opposite attraction. There are so many examples in our lives of opposite attractions. Married people want unmarried, unmarried people want to get married, blah blah blah…
Is it in our gene that to be attracted by features we our own do not have? I don't know.
But my personal think is gaymen are still men in the first place, men like sex, so does it really bother if the partner is different race? And no offence, few friends in my gay friends circle(over 200 east asian bitches ;D) are fond of white guys, they think asians are more cute though white, black, brown are cute, too of course.