[chc]

You might not know this since it's your second language, but it sounds pretty rude in English to refer to Asians as "yellows". That alone will make people read your comment through the lens of "this guy doesn't respect other races."

In informal settings, you can generally call people of western European descent "white" and people of African descent "black," but for other races, referring to them by stereotypical colors will get you pegged as culturally insensitive at best.

Couple that with the fact that blanket statements about races are treading on thin ice even in the most benign circumstances and you'll see what happened here.