Do not mention Chile's Amerindian or Pre-Colombian heritage
Despite being in many respects modern, Chilean culture is nevertheless mostly traditional. If you refrain from publicly disparaging or flouting those norms, you will fare far better. People use conversational tones of speech.
Never bring up Chile's Amerindian or Pre-Columbian history when speaking to Chileans about their nation. Chileans saw themselves as a nation made up solely of European immigrants who settled there. The pre-Columbian era was considered the Dark Ages, and Amerindians were viewed as backward barbarians.
Mapuche people, who come from the South, are not seen as Chileans, but rather as a foreign ethnic group that causes issues for locals and businesses there. It is exceedingly disrespectful to assume that the culture or the people have any Amerindian influences.