but why the anger from higher earning women
In my case, it's because the (female led) HR function undermines women in my workplace. I can get 3 competent, skilled engineers for the price of 1 senior HR employee at work. And 90% of them add nothing. They don't even understand what we do in a lot of cases.
An example: I have a "dedicated" HR person for my unit at work. Who's supposed to help me.
All she ever understands or wants to talk about is shite like wellbeing courses, or mindfulness, or "talent retention", and she has no clue about what we actually do. I've stopped trying to influence her. I'm hoping she leaves eventually. And her salary is taking up 3 engineering spaces for people (potentially women!) who can actually do productive work and deliver.
Why would I choose to hire someone like that in this organisation?
She could start by offering to sort out the lack of female toilets on client sites, or (as i suggested) push for pumping rooms for our female returners (because a lot don't come back from maternity leave, and then they all bleat at the C-level about why their female engineers don't rise beyond middle management).
My "dedicated HR" lady expert is pretty much useless to me as a result. She adds no value, and takes up my operating unit's budget for adding SFA to benefit my engineers, who I care about a lot. And I want more women under me, but I can't hire more without £s, and I can't keep more of them from leaving if HR don't even understand what our job entails.