Calling her “Pocahontas” and getting “war whoops” from the audience is not a claim of doubt as to her ancestry.
It’s a claim that her purported ancestry is something that defines her as other.
And that claim is like a lit match on the oil spill that is American racial tensions, especially post-Obama.
He’s just being a racist in front of a bunch of racists who feel like they can be racist with impunity now that a major political party is nominating an open racist for the highest elected office that the country has to offer. Like, it’s OK to be racist now.