Clashing Cultural Expectations

In America, it's considered rude to live there and no make an effort to learn and speak English, as it suggests a refusal to integrate into society. In Taiwan, it's considered rude for me to speak to Mandarin, apparently because "people have spent their lives studying English and want to practice it." While this is initially a very convenient situation in which to find myself, it's also one of the major reasons; apart from laziness, stupidity and lack of moral fiber, that I don't speak much Mandarin.