“What would be considered”. Sorry
I help out with the youth group at church and one of the students is in the 10th grade and he is pretty retro (loves movies and tv shows from the 80s and 90s). He used to be a big Star Wars fan and lost interest due to "disney making it a princess product" as he puts it. He was asking me the other day how did all this happen or when did it start, and I couldn't pinpoint an exact person who started this but had some ideas.
What did start it all? I know Ghostbusters 2016 seems to be the first movie to actively be made to piss off fans (when the original director was trying to do Ghostbusters 3 and they screwed him over). With Star Wars, if they wanted to appeal to actual women who were fans they could've used Jaina Solo or Mara Jade.
Was it in gaming? I remember when gaming magazines seemed to have constant articles about women in gaming or about the "abuse" they received online as if they have never heard the language you hear where guys get together and hang out.
Comic books? I mean they literally made comics of women sitting around the table discussing feelings and as Eric July said "modern comics are made for 14 year old girls on tumblr who don't read comics"
So honestly who is patient zero or who is to blame?
One of the biggest sources of "modern feminism" as a movement has been the field of Psychology. Its popularization is what helped them convince people to accept a lot of things as "problems" for all of the Civil Rights movements. The most famous being the god awful Two Doll Experiment for black/white relations but that's a different topic. They'd create a story that painted an awful picture, let the media write a dozen bleeding heart stories about it, and then legislation would follow.
But given that, Karen Horney would absolutely be not just the Patient Zero but also the very model they would strive to emulate. From introducing the idea "womb envy" to treating all men as defective women to introducing "mommydom" as a way to control men, all stemming from her. One of the students of Freud himself, making her influence felt in the crib for the budding field, and she existed entirely to tear down his work and push her radical agenda.
Heck even the idea of using a contract to trap men in an abusive cycle to break them down, analogous to alimony and child support now, came from her forcing any client she was doing therapy on to sign a contract forcing them to see her for at least a year no matter what or face a steep penalty. During which time she would break down their psyche until she became their new "mom" and could then delve into their minds from there for her own purposes (under the guise of "helping them").
And from there, feminism itself would fractalize into every facet of society and from there hobbies. Including not talking about her much beyond a footnote novelty because of how bad she makes them all look.