Why are some women not proud of their heritage?

Cause my friend (who i was interested in) is dating some guy from China and hes not even worthy of her first of all he probably not endowed enough and second hes Asian and not Jewish they are radically different cultures. Jewish girls should only be allowed to date Jewish men. But thats what I think. Im not interested in her anymore because she is no longer clean. Im also angry at my sister for dating a guy who came here illegally from Honduras. I found that disrespectful to me and my family. What do you think about it? I think Jewish girls who arent dating Jewish men are ashamed of being Jewish.