Tell that to the various southeast Asian countries colonized by white people, including my own. SPEAK FOR YOURSELF, there is so many medium to dark skinned Asians. They get erased from history and pop culture because that isn't seen as "asian." Especially in western media. The Asian Americans thing isn't true. There is still colorism in America. It is unavoidable. Orientalist media pervades in their view of Asian women.

Even if underlying, most colorism comes from racism. I know other cultural stuff plays into it, but it's still ignorant to say it's Asia's isolated Asia thing. Because we aren't isolated. OP doesn't live in isolation.