Limiting your dating pool to just Cambodians is just as stupid as limiting the pool to just blondes or just Yankees fans. Because in the long run, these things don't matter. Unless you're a special little snowflake who just can bare to sleep with a Mets fan.
I can see body type making a difference, because it's important to find your mate attractive. But even then, don't harp on it too much. I know a guy who refuses to date any girl who isn't a size zero. Unsurprisingly he gets no dates. If he just gave other girls a chance, he might discover that he's attracted to a wider variety of body types than he thinks he is.
I agree with everything you said, but it seems as though dating someone because they're Cambodian is often judged more harshly than dating someone because they're blonde. Yet, from my uninformed guess, I'd speculate that people from a specific country have more specific cultural or personality traits than people of a certain hair color or sports fandom. For example, despite millions of exceptions on each side, Australians are more extroverted and gregarious than Swiss. I can imagine an extremely extroverted Swiss person trying to find a similar companion saying, "I'd like to date an Australian person" instead of the much more complicated process of finding similar personality types among their compatriots.
I can see body type making a difference, because it's important to find your mate attractive. But even then, don't harp on it too much. I know a guy who refuses to date any girl who isn't a size zero. Unsurprisingly he gets no dates. If he just gave other girls a chance, he might discover that he's attracted to a wider variety of body types than he thinks he is.