Because it was a ludicrous attempt to identify with a people whose only connection to you is through the DNA on one side of your family. You did all kinds of internet research, desperately trying to cobble together some kind of SE Asian identity for yourself, regardless of whether or not it's grounded in the present, in one country or another, in archaic genetic populations, or in long dead empires. The ASEAN union is geopolitical, not racial, yet you threw up that song as if it was some kind of expression of racial pride. Imagine a white person throwing up NATO symbols everywhere and identifying themselves with them- it wouldn't make any sense, would it?
This thread is an expression of the same problem. You believe Black people are genetically and culturally inferior to everyone else, yet here you are begging Black folks to tell you that you look Asian and not Black so you can continue to tell yourself you've been disowned/have no connection to one half of your ancestry.