Why are some women more hateful towards fellow women than men?

Example 1: in my UG college, there was this particular female professor who excused everything the guys do (sleep, not attentive, snide remarks etc) but ousted the girls out of her class who were not attentive but were not even creating any ruckus (not a biased opinion because almost everyone - including boys - agreed on this fact). She even gave better grades to some favoured guys in practicals.

Example 2: in one of my past organisation, the female HR passed some really distasteful comments towards female employees (feeling entitled, attitude, etc) while excused the males. Can add more details but won’t as it will not add any value to the discussion.

Example 3: one of my female bosses made me work on weekends. She used to assign me work on Friday evenings with a deadline of monday morning, when she should have easily assigned me that task earlier, while she didn’t generally do that with her male reportees. 70% of the times the work got assigned to me while 30% time it went to my male colleagues. Similar situations I have heard from few of my friends in different orgs.

I am not saying all women are like this. But a lot of them are! Why such biasness 😭 it has taken so long for India to start recognising women as an asset to the country and appreciate their talent, women should be the last ones dragging fellow women down!

Edit: seems like the post is getting heavily downvoted by the women I’m writing about :D