Seems like you're not familiar with the history, yourself.
First and second wave feminism weren't coopted by upper middle class white women, they were founded by upper middle class white women. You can't get more white middle class than Anthony, Friedan, de Beauvoir et al.
Not that Wikipedia is a particularly good source, but your own link includes the sentence "Feminism at its core is a movement to abolish the inequalities women face" which is exactly what I said. A poor boy with troubles in Appalachia is tragic, to be sure, but is not any sort of feminist concern.
Intersectionality isn't a just way to garble up different justice concerns and call it "feminism." Intersectionality comes from the intersection of the axes of oppression on e.g. a black woman. The axes of oppression on a poor white man exist, but have little to do with feminism. This person lives in the privileged position under patriarchy, full stop.