That's not what anyone is talking about when they mention dismantling white privilege, though, and you know it (at least you would if you ever paid attention to what people are telling you). The idea behind calling Bernie Sanders' outfit an instance of white/male privilege isn't to demand that he, or white people in general, stop wearing mittens - it is to remind readers that a woman or black person sitting in his place, instead of becoming glorified in a meme, might well have been criticized for their unprofessional or "ghetto" posture. That contention may not be accurate, but at any rate it is dishonest to pretend that the author wants to bar white people from wearing mittens.
The author did not "remind" readers of anything. The author
engaged herself in a fantasia that women and black people did not have the privilege of wearing mittens on a cold day and expected us to believe and sympathise.
You know, when it used to be an (explicit, legally codified) white privilege to sit in the front of the bus, civil rights activists didn't want to force whites to sit in the back either - they wanted the right to sit in the front opened to everyone. In the same way, saying (whether right or wrong) that wearing mittens and casual clothing at a ceremony like that is a white privilege doesn't translate to demanding that whites should be stopped from doing it; almost the opposite, it means we should stop scrutinizing non-white people who do the same or similar things, stop calling them unprofessional/ghetto/poorly adapted to life in America over a personal choice of clothing.
Bernie Sanders did not look unprofessional/ghetto/poorly adapted, not because he is white, but because he was fucking dressed appropriately. I do
not understand the fucking memes that are all over my facebook nor can I see what the fuck anybody is talking about. He doesn't look shabby, he doesn't look like anything except an old man wearing a coat and mittens for a winter fucking day in DC.
The person documented in the OP made an attempt to capitalise on the popularity of a meme to spread her false gospel. Too bad she misjudged the limits of even the left wing audience for this crap (though, no doubt, there will be people who 100% believe her and will point to people's incredulity that she is exactly correct about privilege).