Seems more like a attitued issue then a race issue. People from other cultures have different values and dating expectations, and they can take a long time to overcome. Lots of cultures believe women inferior, and bring their attitudes to their new home. I know a guy I worked with who was Chinese and said more then once he would never marry a western born Asian woman, because they did not know how to be good wives. So it goes for the women too, they are raised to know their place in context to the culture.
Sexist pigs come from all over. I am white, and have dated Asian men who where dominating pigs and others who were as modern as I am. Guess who I dumped real fast and who got a second date? In my experience even second generation males can have a bunch of old world ideas about a woman's role, but it is not a hard rule. BTW the most sexist jerk I ever had the misfortune of dating was a black man who showed his true feelings over time, so there you go, pigs come in all colours. His dad was probably sexist and him mom probably put up with it, so it went to the next generation. Race had nothing to do with it. Date whom you like, but it is not a problem of race but of attitude and that goes far deeper then your skin. There is a whole side of my family who is Japanese American who have been in the US for three generations now. None of my Asian or half Asian male cousins have the opinions James holds, because they were raised with modern western ideas, but in Japan there are plenty of men who think women should serve their men. There are also lots of men who's families have lived in the US since the Mayflower that think women are servants and slaves to their husbands, so limiting one race or ethnic group doesn't make sense to me. It is not only Korean culture that has these problems, and not all fit the stereotype.
I am glad you found a good man whatever his race and hope it lasts, but give Asian American men a chance as individuals. You will see very quickly who is sexist and superior and who isn't. Don't pre-judge all Korean men or Asian men generally, because it will affect you in more ways then dating, like people you work with, are just friends with ect. If your daughter one day brings home a Korean guy, give him a chance to prove you wrong about your past experiences. Your right to worry about James' son, growing up with his dad will make life harder for him if he adopts the same ideas about women. He will never know the joys of a loving relationship with an equal and a partner.