You probably say this is sexist and racist in the sense that it's "racist against white people" and "sexist against men," right?
I actually think Claire's post is, ironically, based in regular racism (against non white people) and sexism (against women).
Why? Let me explain:
1. The noble savage trope:
The poor innocent oppressed non-white people are elevated to the status of angels and saints, rather than being recognised simply as humans, with similar flaws to all other humans.
Notice that OP is white as snow. A white woman performatively shitting on "white women" and thus implicitly mystifying the non-white as inherently more wise, moral, and so on.
Anyone with a basic understanding of world history would know that no ethnic group is devoid of bigotry, warmongering hateful sentiments, and so on. (Which doesn't justify white people colonizing and oppressing them, obviously.)
2. Hatred of "white women" is just basic misogyny:
Especially when it comes from someone who mystifies non-white people as explained above, this vilification of white women is likely to be based on a subconscious view of white women as "default" women, as opposed to "special" women (of color, queer, trans, and so on).
So, the hatred against "white women" boils down to seeing women as undeserving of empathy by default, despite having suffered gruesome sexism throughout history.
They are only deserving of empathy if they are part of some other oppressed minority. Woman is bad by default (when white), and only deserves respect if she can prove to be a victim of something other than "just" misogyny.
Catharine MacKinnon wrote something about this a long time ago:
https://openyls.law.yale.edu/bitstream/handle/20.500.13051/7152/06_4YaleJL_Feminism13_1991_1992_.pdf
Relevant part starts at around page 18. The most sarcastic bit attached, to give a taste, but it's worth reading more of it.
