I DID know how to use chopsticks because I had been to Japan 40 years earlier, but the difference in food styles between central China and southern China is quite remarkable. And I was served sea worms--twice at one banquet--as an "honored guest."
And yes, I ate them. I also think I ate stir-fried Godzilla because I had NO idea what it was, but I know it came out of the ocean.