Korean, not Chinese, but I've gotten that too. Some of my classmates in high school (it was an international Western-style school in South Korea) would visit the US during the summer, and I remember one reporting that people kept assuming he was an expert in kung fu or karate or something because he was Asian, even if he knew nothing about martial arts.

And oyceter, get the rant out of your system sometime. I get snarly when in-laws ask, "What you been cooking for Joe?" Because, of course, I never need sustenance, and he is incapable of cooking. (He's been cooking at a subsistence level longer than I have!) Or my dad with his "You should buy a small grill and cook steak for Joe." Joe's response: "I don't even like steak that much! Why?" Yes, why? Roar. Stupid gender assumptions.