This is tied into the problem that the left has with a lot of protests and campaigns. The real/best answers are always nuanced, but if you try to fit that into a meme, or in a slogan, or in a soundbyte, it just ends up being garbled gibberish. The "Not All Men" argument obstinately ignores the fact that having a nuanced discussion through a megaphone at a protest just does not work. Of course it is not all men, but it is a large enough proportion to be seriously worried about.
This is similar to BIPOC fighting back against the KKK and all the similar organizations and being told they're bigoted and wrong because it's not every white person that's a racist. Of course it's not that every white person is a racist, and of course it's not that every man is a monster, but to grab attention and make a statement, you have to trim the nuance out and pick the most important piece out or else your protest just gets lost in the noise.
Protests are a very truncated form of communication and there are many people here on Lemmy that are pointedly forgetting or ignoring that fact in their outrage and offense in response to this protest.
I would assume that you would understand that this kind of protest works better when applied without exception, even when there is acknowledgement that there are exceptions among the people impacted. Hopefully, those men who are allies in this would be understanding of the fact that if these women made exceptions all over the place, the power of the protest would be significantly diminished. It does require a reciprocal sacrifice on the part of men that support women in this endeavor, but that should not be thought of as an offensive or undue burden.