There are few, if any, feminists who think male and female are the same and/or that it’s politically correct to say we are “all the same.” Struggling for men and women to have equality is worth it for our differences, not our sameness.
Also, using the B word is sexist. Imagine the same scenario with a break up couple where one uses the N word. It is inherently racist, as that “Bitch’ is a sexist word. Also, this was a true example, not an imagined one. One can “imagine” almost any scenario among humans being hurtful.
I write about magnificent masculinity a lot, but it often feels that writers are told they are “anti male.”