No worries. I just feel uncomfortable using the word "Indian" to refer to anyone other than people from India and it bugs me to see others do it. I'm particularly put off by "Injun". In Canada we are not proud of the actions of our (mostly) European forefathers against the indigenous populations of North America and we therefore avoid glorifying or joking about "Cowboys and Indians." Well, many of us do, anyway.
Old habits die hard though, and the older generations were used to the word. To this day, my father still jokingly calls my mother (1/4 Cree) a "squaw" if she smells of a campfire. It's a little joke between them and they mean no harm, but I still don't say it myself.