"Redskins" is really racist. Braves, Indians, Chiefs and Blackhawks aren't inherently racist, but offensive to many Native Americans (and others) because Native Americans had no say in naming those teams and were reduced to mascots while being herded onto reservations. It's pretty gross.
At Braves and Chiefs games, fans do a "Tomahawk Chop" routine while "Indian" music plays over the PA. Also pretty gross.
But the most offensive of all is the Indians mascot for decades, Chief Wahoo". It was still available on team gear as recently as 2020-