Once upon a time we all ate uncooked food using our fingers. Those who learned to cook our food and to use knives and other cutlery were able to eat without transferring so many germs from fingers to food and thus lived to produce offspring.
Now, it's easier to improvise chopsticks than knives and forks, so those who have learned to use them will be the ones more able to feed themselves cleanly when there is no cutlery to hand.
Evolution does work, Sherman. You just have to accept that the Chinese have evolved further than you.