I always found it surprising that the US calls regions where people live the same as regions where protected animals live (reservations). Isn't that offending to anyone? I would be deeply offended.
Speaking of Canada. They call their's "reserves" which almost got me into a fight in Canada when someone asked the Dakota I was traveling with "what reserve are you from?". He took it, uhm, poorly. It took some fast talking to calm him down. He did not come away with a good impression of Canada although winning at the track later in the day put a positive note on our travels.
The reservation system is a broken acknowledgement that the US stole land from all of those tribal groups, but the purpose of a reservation is to set land aside, to reserve it for those tribal groups, to say the government cannot go any further.
There's much better things to be offended by. Nobody is offended by hotel reservations.
Particularly on difficult topics, if you think someone's giving something too little thought, err on the side of giving it more thought rather than something shorter. I sympathize with a desire to be concise and pithy, but it can so easily be read in more ways other than it's intended. There's just less info there: fewer error correction bits, so to speak.