It annoys me every time I read the word expat and its derivatives. You became an immigrant, by emigrating to the Kingdom of Tonga. Only because you are white and rich doesn't change the concept of emigration to warrant a word with less stigma.
Immigration is a tricky subject with many nuances, pretending otherwise i.e. driving the immigration = bad line and calling immigration that affects ourselves or that we don't find objectionable expatriation is disingenuous and hinders good quality discourse about the topic.