I lived in Taiwan for 7 years, and absolutely loved it. And yet, my Chinese is still rudimentary at best. For me, it was a combination of my job (teaching) which required me to talk to people in English all day, and my introversion, which meant I really enjoyed being in my own little world with no expectations to make small talk with strangers. Most of the time it was even nice to not understand everything being said around me - when I heard English in public it felt like a real intrusion on my own little world.

A serious study of Chinese also would have meant less time for my hobbies, friends, and writing.

To the best of my understanding, that's why i didn't learn, and it had nothing to do with feeling superior. I'm actually really embarrassed about my bad Chinese.