It's not blackface. Nobody is impersonating Bojangles, Massa Tim.
Football fans only paint their faces for fun, not to get permanently butthurt white liberals angry, which is more of a humorous side effect. Can us Lions fans get away with paint our faces blue and silver since there are neither blue nor silver people to insult? The only reason the kid wears black and red facepaint is because his favorite team wears black and red, and the only cultural statement he's making by doing so is that he really likes the Chiefs.
But no, it's blackface.
Then, hilariously, the kid turns out to be Native American himself. So the white liberal is now lecturing the Native American for dressing like a Native American, which isn't supposed to happen on the victim hierarchy chart that you yourself subscribe to. Sadly, you picked the wrong kid to fake accuse of "white supremacy."