Well, in the course of his administration, their have been events, and comments from Trump, that have not been taken well by many Native Americans and their supporters. Just a week before this incident, Trump included the Wounded Knee massacre in a "joke" about Elizabeth Warren:
https://studybreaks.com/thoughts/trumps-wounded-knee-remarks/
That certainly was fresh in the mind of some, and by now opponents of Trump have come to expect these insults from him anyway, and for good reason. Referring to Warren as Pocahontas at an award ceremony for Navaho code breakers but one recent example. I mean, everyone knows he only talks to his base, that he's president only to those Americans, there's never been a more exclusionary president in our recent history, so of course the Native American is going to get the benefit of the doubt in the minds of many Americans, with a MAGA hat in the photo. MAGA in the story line. People can say that's wrong, makes perfect sense to me. The president is exclusionary toward minorities.
Much longer term reasons behind the benefit of the doubt too, obviously. Native Americans have not exactly got the long end of the stick over the course of our nation's history. Started a long time ago. Didn't have the right to vote till 1924, I read today didn't get the vote in Utah until 1957. Just the tip of the iceberg of a complex and difficult history of American and Native American relations. (Where I live, the English introduced total war to the natives, by roasting them alive by the hundreds in two huge massacres of woman and children. The natives here were unfamiliar with that style of "warfare".)
So, throw a MAGA hat in the equation, a veritable avatar for exclusion of people of color, and you just get a most recent reason why he would be given the benefit of the doubt by many.
So, just trying to provide a little context as to to why he might get the benefit of the doubt.