I remember reading about Quong Mei Taht (he later Anglicized his name to Tart) and how, the day he married his Anglo-Australian wife, his father-in-law erased her birth record from the family bible. I also remember reading about how William Ah Ket, the first Chinese-Australian barrister, telling the woman he was to marry, Gertrude Bullock, that if he could marry an Australian woman, may he could finally be accepted by the Australian community. He courted her for four years before he had her father's approval to marry her.
My first girlfriend was Asian, and I remember two things. Okay, we're not together anymore, and that wasn't for racial reasons, but we wanted different things. One incident was in a shoe shop where I paid for two pairs of sandals for her and the sales assistant told me not to let her spend all my money. Now, she might have been only joking, but you can see how it looked. Another, was a person who said, "Have a baby, and your parents will fall in love with it." Not necessarily. I knew a white guy from school, who had white hair and blue eyes, who had a relationship with a black woman, and got her pregnant, and his mother acknowledged that her grandchild was beautiful, but the rest of the family didn't want to know.
Interracial relationships show that the people in the relationship, if they are in it for love, are open minded, not that society is less racist. Education and a willingness to accept it is what is needed.