当然，为什么我不能在中餐馆吃饭时用筷子。 我不会用它们来吃非亚洲食物。
Google Translate, from the Chinese: “
Of course, why can't I use chopsticks when I eat at a Chinese restaurant? I will not use them to eat non-Asian food.”
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I’ve lived in Japan for over thirty years and my wife is Japanese. We now split our time between the US and Japan.
We use them often, and not only for Asian food. I think for some things, like salad, they work better than a knife and fork, especially in a tiny economy class airplane seat when you're trying to eat off a tiny tray, cheek by jowl with your neighboring passengers.
At home, depending on what we’re eating, we’ll use chopsticks, but if eating out will generally use whatever the restaurant gives us. The occasional exception being Thai restaurants. The Thais don’t use chopsticks (or knives), but generally have chopsticks around in their restaurants for people who think they do. Maybe half the time in a Thai restaurant I’ll ask for chopsticks simply because some Thai food — say noodles — is easier for me to eat that way.
At home, would not use chopsticks for lasagna but would for fish, for example. Steak, we generally slice up at the table into bite-sized pieces when serving, and use chopsticks
(I had an eccentric uncle who in the early 1970s began eating everything, including his ice cream, with chopsticks. He never explained himself, but I think he just got a kick out of being eccentric, which I can understand.)
Chopsticks differ by country: Japanese ones are smaller than Chinese ones, and usually made for one time use, although lacquered or plastic ones for multi use also abound. Korean chopsticks are frequently made of metal, and about the size of Japanese chopsticks. Chinese ones are maybe a third bigger.
