I knew that the general populations of tumblr hated non-white women with a burning passion only matched by their love of shipping two white guys together but after reading the KimberlƩ Crenshaw essay that originally coined "intersectionality" and seeing the way its been bastardized on here legitimately has me seeing red. The way something as simple to understand as, "women who exist on multiple axis of oppression, i.e. black women, often have their unique experiences erased when separate discussions of anti-black racism and misogyny are had" has been warped into "marginalized white people and men face unique discrimination on account of them being [insert marginalized identity] + white/men and if you disagree ummmm haven't you ever heard of intersectionality? *links wikipedia page* checkmate, bigot!"
Like, I am just at a loss for words. I don't know how to explain to these people that marginalized white people and men are not oppressed or neglected on the basis of being white/men, so it's quite silly (and that's being generous) to assert that there is any type of intersection between their marginalized identity and their identity as a white person/man that makes them uniquely oppressed. In fact, in positing such notions you lend credence to fascist concepts such as "anti-white racism" or "anti-male sexism." And when I try to explain this, they will ignore me, hurl misogynistic and racist slurs at me, or most bewildering of all bring up white people and men with additional marginalized identities as a "gotcha!" of... sorts. Either you fundamentally do not understand what I'm trying to explain to you or you're being willfully obtuse, but either way you are twisting the writings of black feminists so that they can fit into your incredibly reactionary worldview and I refuse to engage with you ghouls any further on that basis.
TL;DR: Before you try to lecture anyone, let alone feminists of color or transfeminists (least of all feminists who are both!) on "not understanding what intersectionality is," you should probably read the original essay by KimberlƩ Crenshaw first. This may seem like a no-brainer, but alas, it is not.