If you look at ex-feminists who have strayed from the group they're treated much like (many) Christians treat ex-Christians.

People who "knew the truth but turned their back on it" get a special level of disdain from groups with strong ideologies, in their eyes it's worse than being ignorant of the truth.

That being said it's hard to imagine the author receiving more venom than all the men who wouldn't have dreamed to write such an article.