I'm going to be generous and actually put in a serious reply here. If anyone is offended by my comments, feel free to PM or e-mail me your flames in private.
LPX, if your friend is white and he is only physically attracted to Asian women, what he has is like a fetish, which explains the bashing here.
The majority of Asian Americans, myself included, are willing to date over ethnic lines. If the girl is willing to date you, she is giving you a chance. If she dumps you and say "oh I think my family wants me to marry <insert Asian nationality>", she's giving you a face-saving exit. It's called mercy killing.
Southern California is a very competitive dating environment. If your friend is only interested in dating a minority ethnicity, the supply/demand doesn't work in his favor. It's even worse if the girls here are repulsed by his "vibe". If he ends up dating or marrying someone who wants to be with him so she can rebel against her parents, that girl has issues and they'd probably get a divorce.
Hollywood and western mass media has generated some demand for foreign men overseas. In most East & SE Asian countries, women who actually prefer foreign men are in the minority (~20%), but there are many millions of them and even a small % adds up to a lot. The supply of single foreign men there is very low, so the numbers work out in your favor.
I've visited many Asian countries, and the one that's most accommodating to foreigners is probably the Philippines. If Taiwan/Japan/etc people are generally antisocial in public and have to depend on mutual friend introduction or sign up with some dating service. In the Philippines you can go to a mall and chat up girls like a normal person, without them looking for an escape hatch in the first 3 seconds. Just make sure you avoid the red light districts.