I grew up using both chopsticks and forks and use the one appropriate to the task. It does seem you use chopsticks more with Asian food, but it is form dictating function. Most American food consists of a big hunk of uncut meat or sandwiches, or some kind of stew, soup, chowder, gumbo. Those just aren't chopstick style foods. Besides, for some reason when eating chinese food and going in with a fork, I get this thought of metal tines scraping my teeth and quickly switch to chopsticks.