You're absoultely right that "fragile white womanhood" is really more of a middle and upper class phenomenon -- I actually wrote about some of that here: https://devonprice.medium.com/not-all-girls-are-expected-to-be-feminine-cc2c59e4c25b

Even knowing better, I oversimplify things in how I write about it in this more recent piece. But you're right. It's more of a wealthier white woman thing, not a white woman thing across the board.