I can't help but think "yes, all men" was specifically made to sabotage the movement
This had to be a troll or someone who intended to sabotage the movement. And it seems to have been fairly effective because it caught on and a lot of people have said it, unironically.
They will go to great lengths to try to argue that it's not a bigoted remark even though it clearly is.
It has effectively shown how hateful toward men the movement can be and how incredibly easy it is to brainwash people into saying something hateful