“+300 of my people were massacred at Wounded Knee,” the writer and tribal lawyer Ruth H. Hopkins, who is Sioux, said on Twitter. “Most were women and children. This isn’t funny, it’s cold, callous, and just plain racist.”

Ms. Hopkins said in an interview on Monday that the trauma of the massacre hasn’t been erased by time.

“It happened in 1890; it’s not so far removed. Those killed are peoples’ grandparents and great-grandparents,” she said. “It’s further compounded by the fact that the soldiers who murdered Lakota at Wounded Knee received medals of honor for it and those medals have never been rescinded.”