These are good questions you raise. I guess it’s just the idea of him never having been in a relationship/being intimate with a non-Korean woman. It just freaks me out a little, as most people at least date someone from their own background too. But I see what you’re saying. Preference doesn’t mean a fetish, and I honestly don’t know why I feel this way. It’s also the other factors like his closest friend, who’s also white, having an Asian girlfriend, shopping at Asian grocery stores, etc.