I'm a white guy, and I don't try to justify or rationalize my love of Asian women by writing lengthy articles such as this one. I just love Asian women, they're damn hot to me. Asian is sexy, I'll admit it. Come on, buck up, author, you pussy.

Samantha:
"He is not good looking but because he is white"

You go on to accuse him of being a closet racist after saying this. You hypocrite!

I have spent many years researching this phenomenon (informally, in my own time) since it applies to me too. Why are white men who are attracted to Asian women universally vilified and slandered? One conclusion that I have come to is that when you are defined in the public eye by a characteristic that you can't change, in this case your orientation, and if the sum of all individuals who fit that definition hold little or no power or influence over the public, then it is natural both that the public will attempt to extinguish you for being different (group competition) and embrace your diversity (varied choice). The reason why there is none of the latter in this case is that, perhaps out of sheer myopic ignorance, most people exclude whites from the mere concept of diversity. So I believe what this comes down to is precisely as you said, a general lack of understanding.
I hope that in the future, more people will come to understand this. It is especially disheartening that the dehumanizing preconceptions are most stringently held and espoused by Asian women (mostly American-Asian women). Fortunately, in places like Hong Kong, women are generally not so offended by it (in my experience).

I saw what you look like on the street and you are not cute!

He is not good looking but because he is white, he thinks all of us would want him. Not the case.

You completely have an Asian fetish. Do NOT deny!