We stole their country
Which they stole from someone else.
gave them smallpox infected blankets
Myth. There's one documented case of weaponized small pox, by a Brit, long before there was a United States.
John Wayne movies, killed all the buffalo, broke treaties,
List of things CA finds equally offensive: germ warfare, genocide and John Wayne movies. Good list man.
slaughtered millions of them,
Completely false and ridiculous. Did you learn American history by watching F Troop?
and stripped Jim Thorpe's Olympic medals.
We being evidently the Swiss, who stripped the medals and have since restored them.
Now they have to endure team names that are derogatory references to their skin color and offensive cartoon caricature mascots?
The reason sports team have various forms of Indians as mascots is because Indians were commonly thought of as brave and fierce. If you think calling someone an Indian is derogatory, that's your problem. Still, I bet Native Americans are happy to have you to explain for them why they should be offended by this and that, hashtag white privilege. That said, Redmen would be a public relations disaster. Which is why I like Red Tide.