Also, you're responding to an argument I didn't make. I said nothing about intersex people or any "one-drop rule". My point was that second-wave radical feminism centred sex as the basis of women's oppression under patriarchy, leading to advocacy for women-only spaces. Which is exactly what JKR is defending.
That is the continuity I'm highlighting. It was in response to your earlier comment:
> Second-wave feminists would deplore her bio-essentialism. She is an anti-feminist.
