I do understand where you're coming from, but I think this sentence here is the disconnect. You're taking a broad set of beliefs, attitudes and personal experiences and applying them to everybody who voted for Trump. I think this is a mistake, not least because people's experiences differ. As I've said many ties, I don't really understand why anybody would vote for Trump, but it's safe to assume that the black people who did so didn't do it because they thought the civil war was a noble cause of state's rights.

The issue seems most likely to me to be simple selfishness and stupidity/naivety. People of colour aren't immune to this. Some voted for him for tax breaks or because they feel threatened by immigration. They want to pull the ladder up behind them. Some because they are contrarians and mistake being controversial for being intelligent. Some because they were gullible enough to believe that Trump would fight for them (many poor white people were equally gullible).

There are doubtless many reasons why people of colour made this mistake, many of which had nothing to do with racism. Using their stupidity as an excuse to attack their identity is what I object in Cristina's piece, not the attempt to unravel it. I've written about his topic myself, just without the divisive language.

To answer your question, If you believe that somebody is a racist and misogynist but a woman of colour supports them, what you do is look deeper to understand what she, or you, or both of you are missing. If possible you talk to her and ask questions. It's so sad that in a world where it's easier than ever to talk to people with different points of view, we've abandoned this strategy. I don't think waving a wand and saying "Ah, she's just expressing multigender/multiracial masculinity/whiteness," is going to get you to the right answer very often.