Atlanta Braves... Criticized for other reasons. e.g., the "Tomahawk Chop" Cleveland Indians... Not sure how that could be insulting on its own. See Vikings. Florida State Seminoles... Have an agreement with the tribe, and dispensation to use the spear ceremony. Kansas City Chiefs... Again, not sure how that's insulting Golden State Warriors... Ditto Vancouver Canucks... The only way that could be considered insulting is that the national nickname is appropriated by one team. See Yankees.
If you can't see how Redskins is in a different league (as it were) than the above, I don't know what to tell you other than stop opining on the subject. This is not in your wheelhouse.