Really appreciate your insightful reply!

Particularly because my angry order of some books by Foucault will take time to arrive. I think Helen Pluckrose also mentioned Foucault's influences in her tracing of the history of queer theory and gives a summary in her talk here .

I'm dying to know who was it Butler was so miffed with - probably radfems glorifying the female goddesses Lol

So far I found Butler's ideas, specifically on abolishing the categories of sex, clearly articulated in Wittig's writing. This article explains the connection and summarises Wittig's writings. It also makes fun of Butler misunderstanding and misusing her sources. For that alone a great read, for those who have time for a bit of schadenfreude.

Ps: I'm sure you're well informed on the whole schtick, I just included the links for those who might be entertained by digging around a bit.