He was already very racist in private beforehand, and Vivian has talked about how he routinely tried to make her man up as a kid. Also all of his children were conceived using sex selective ivf.

He always had a fair bit of his dad in him. Very much the vibes of the dad who swears he'll never hit his kids like his dad did, so he just emotionally abuses them and starts to see his dad's perspective when his kids go no contact.

I think the big turn for him was his daughter being anti rich and the rise of anti rich sentiments in the modern American left. That and the lawsuits for racial discrimination in his workplaces