I’m sorry, what even is this argument?? The commenter above you is saying that women have enough proven experience of men being shitty to have to prepare for it in every interaction. Even if they know that it’s ‘not all men’ it’s enough that they have to assume it could be any single one.
The only way this could be comparable to racism is if people had legitimate reasons to mistrust other races, which is not the case. Racism is the result of exaggerated stories and mistrust being created about a community with whom the racist generally has no connection.
Most of the time women being wary of men doesn’t lead to misandry, it just leads to world-weariness and guardedness around men until we know we can trust them. But even if it did, misandry and misogyny are not equivalent. Misogyny is a prejudice which has been embedded in society for millennia and which has only begun to be deconstructed in the last century. Misandry is a response to this condition, but it is not structural, it’s the position held by a handful of women exhausted by their shitty experiences with shitty men.
It’s honestly a wonder that more women don’t viscerally hate every man in existence, and men should be thankful that we continue to go out and put ourselves out there despite the plethora of bad and downright dangerous things we’ve experienced. Knowing that men can do awful things and preparing for that possibility is just a survival tactic for remaining in the world.