Many of these white guys seem to have "Asian souls and personalities", hence we call them "eggs" - white on the outside, yellow on the inside. So even a White guy who is not too masculine is still well suited for an Asian female, as long as she is more feminine than he is of course.
Now if you're an Asian male, don't get too down just yet.
Those are the types that are more likely to date Asian men.
In addition, the mod/goth types of white girls, who like to dress in all black and are into witches and vampires, like the famous icon El Vira, also tend to like Asian men or are more open to them, in my experience.
A typical Asian guy looks way too meek and feminine to them.
They are not masculine enough for them, nor sexually attractive to them either.
Now, I am not saying it's impossible for Asian men and White women to have good relationships or stick together, just that it's low probability and does not usually last long.
Therefore, if you are an Asian male with a fetish or preference for White females, I would say it's ok to go for it, as long as you: don't take it too seriously, expect a lot of rejection, and don't get your hopes too high.
And of course, as long as you understand that this pursuit is a low probability endeavor that will not work for the majority of Asian men (though there are exceptions of course, which can be found if you look for them) and therefore is just for fun or to satisfy your curiosity.
Granted of course, there is a subset minority of white women that have a fetish or preference for Asian men and/or an interest in Asian culture.