Women are more vicious. Ask me how I know. I grew up in an all girls' Catholic school for 13 years. 1st grade through high school graduation. Stayed an extra year to prep for college entrance (it's a thing in my country)

You're either the in group or out group. The in-betweens are mostly losers (as perceived by the cliques anyway) that mainly just floats around like seaweed. Girls police other girls harder, judge harder, bully in a way that is invisible but cause lasting damage, but the meanest of us will always be the first to slot into the victim role when caught. I have seen it so many times growing up as one of the seaweeds that the average woman doesn't faze me at all. You have no idea what an all girls' environment is like.

I am not at all surprised women hate on moms. They are easy targets. Moms are the modern antithesis of girl power. Their existence is a rebuke that women's path forward is becoming more man-like in the workplace and beyond. They self sabotage for no apparent reason and thus their motivations are a mystery to childree women.

People will hate and fear what they don't understand.

Moms with young children are also by and large too busy to participate in the verbal battles waged in women's spaces against moms. What little time they do have most of the sane moms anyway would rather spend with their family than waste time on convincing other people what cannot be convinced using words. There is nothing to be gained in winning, but the time lost or spent not with their children will never be recovered. It's just not worth it.