I knew an indian who loved indian jokes and had an “Indians discovered America” sticker on his car. He and his buddy were playing a pow wow for the white folks and their “lyric” sheets blew away. He said, “We just started going ‘hey-ya, hey-ya, hey-ya!’ They didn’t know the difference!”
None of friends who are tribal members have ever expressed to me that they are offended by the term Indians. Most have a great sense of humor.