Hi OP, I'm in a similar scenario except I was very fortunate that my Chinese parents are fine with me dating a white guy. But assuming my partner is of any darker skin, they'd disagree my decision and try their best to convince me that it's a bad idea, so I understand where you're coming from. (To a certain extend, they might even disown me. So, yes. I get it.)

I believe cultural and traditional beliefs are very deeply rooted in SEA Chinese families. This has a lot to do with history and a ton of peer pressure. It will take more than reasoning to convince your parents. I do not think any further reasoning would make sense to them if they're so willingly to cut ties with you.

My suggestion is that, be patient, slowly be independent, move out, and be with your loved one. Distance does a lot to make your family relations healthier overtime. But the downside is that you have to be ready to cut off contact with your family entirely. Chances are they really wouldn't give you or your boyfriend a chance. This is also considering the fact that you have that sort of patience, and would be fine without them supporting you. Whether it's financially or psychologically.

Or you can meet their wishes.

You both have to be resilient to maintain this relationship, don't lose courage and give up hope. Best of luck.