In my current game, Aztec-ish Aaracokra invaded Spain. The party stole one of their flying skiffs and is trying to figure out how to prevent Huitzopochitl from manifesting on the material plane (very bad).
Unless your setting is at peace, which would probably be boring, somebody's always invading and exploiting someone else. Maybe it's Steppe nomads, or the Romans, or the Egyptians, or the Zulu, or drow, or dwarves, or hobgoblins, or elven imperialists, or the Scarlet Order, or whatever.
In a pre-industrial context without a meaningful financial system as a way to gain and maintain multi-generational wealth and capital and drive improvements in living standards, the best way to gain more wealth, power, and population is to invade someone else's land, take it over, and make them provide resources to their new overlords. Slavery/involuntary servitude/impressment/corvee labor is often part of the deal.
Historically, it's often been the case that the invaders were seen as less 'civilized' (Goths, Huns, Mongols+Turks+Tamerlane+Mughals+Manchu steppe nomads, Vikings, Barbary pirates, Magyar tribes, Macedonians invading Hellas, etc.) than the "civilizations" that they were successfully able to prey on.
As long as there is conquest and subjugation going on, some people are always going to find things to be offended at and to call nasty names. It's your choice as to whether or not you let that type of person shape your creative output and cause you to self-censor, or not.