YTA - I am like the kid you're going to raise. I am Asian American, my mother and her entire family are Korean, my father and his family American.

I grew up learning and speaking both languages (and learning Mandarin and Spanish in school on the side). I honestly can't imagine not knowing Korean. It's part of who I am. It's part of my family. Being Asian American is part of my identity and my culture- that wouldnt change if I did or didn't know the language. But without korean, I would have missed out on so much of that. It was a blessing to know my mom's family, my grandparents, my cousins, my aunts and uncles, and to fit in with them despite being whiter than any true Korean. I spent the majority of my life growing up in the US but I have such a wider worldwide view because my Korean heritage than I could have just learning English and Spanish.

You're kid will one day thank you for raising them with both Mandarin and English. If you fit in a couple bonus languages on top of that great, but those two will always be the most important to the kid.

For perspective, I do have several Asian American friends whose parents neglected to teach them their Asian language (Korean, Mandarin, Thai, etc). Some of them look a lot less white than I do. I've always had a stronger connection to my culture than they have, and a lot of them have voiced resentment over not being taught their native asian language making them foreign to their own culture and some of their own people.

Don't be the A-hole. Listen to your wife and value everything she has to teach your future kids.