A Final Word
The purpose of etiquette is knowing how to treat other people in various situations - but there is no single set of rules or answers. Be attentive and observant, and consider what is appropriate in any given situation from the perspective of others.
In general, if you control your behavior, and seek to value others (and especially, no to denigrate them), then you'll be able to handle situations with grace and confidence that will create a positive impression.
EN: Proponents of etiquette often take the perspective that it is something people should voluntarily do, of their own free will - but it is no less sinister (and perhaps even more despicable in it disingenuousness) to imply that someone should stop being such a [insert racial/ethnic/religious/other epithet here] of their own free will, because it's necessary for others to accept them.