The gist of the article is that she felt slighted, neglected, abused by her female manager. Because the manager was white and female, and they obviously didn't get along, she inferred that it must be the white supremacy channeled through her. What exactly made this dysfunctional relationship between a white subordinate and a white boss into an act of white supremacy on the part of the latter is anyone's guess. The author is obviously an unreliable narrator; but even if one takes her story at face value, one is left to wonder why she does not discover a deeper generalization that people are people, and sometimes people are bad, and power corrupts, and if a woman can be as obnoxious as a man, then maybe a non-white person can be as obnoxious as white.
Also, this paragraph from her article has left quite an impression. Is this... normal?
I spent eight years at the first tech company that employed me. Every single manager — I had at least five — was a salt-of-the-earth type person. People who made sure you got home safely after work. People who took you out for coffee when they noticed a change in your demeanor. People who showed genuine interest in your life. People who mentored you and were excited to see you grow. People who explained how they did things, opened their networks to you, and encouraged you to make mistakes. People who stayed late on Thursdays and held an ice cream club just for you so you could have a reliable time every week to plan your future together. People who knew how to have fun while working hard. People who showed me what a real community does for their own members when you lost a parent and needed to feel safe somewhere. People who still check on you eight years after you leave.