Thank you for your thoughtful reply, which is refreshing.
I do recognize, and have often seen, that “gotcha” tendency, and the often accompanying motive of doing it merely to make oneself feel superior to other supposedly clueless white people, and thus the narcissistic circle jerk back into the belly button of whiteness that such gestures ultimately peter out into. I’m so glad you didn’t stop there, and I hope my comments about this film don’t come across that way.
I agree with what you seem to go on to say, which is that it’s good to call out whiteness, to label it, to recognize that being white has a lot to do with one’s perspective and, probably, with one’s place in the order of things. People of color often see white people AS white, and simply doing so is not racist; clearly (and we seem to agree on this), white people should see themselves that way more often too. Then they could learn how to fuck up less often, for starters, which they usually do a lot more than they realize, and maybe some of them could even work against what remains a racist social order. Perhaps, for instance, by making a film that speaks explicitly about the whiteness of teenagers while also speaking of of the blackness or brownness and so on of other teenagers. 
