This is not just you and Trump. It is simply how the patriarchy works. Think back to how boys were raised when Trump was young and this describes "masculinity" as it was taught to many boys.
As for that book, no need to feel guilt at taking a job for the pay. If you hadn't written it, someone else would have.
Perhaps, it might help to ask if this is just more of that 100% right or 100% wrong type of thinking.
Thing is, we can analyze the past until the cows come home, but we can't change it. The greater question is what to do going forward, and what actions might affect the changes needed.
Perhaps sharing some of the insights you alluded to from when you worked with him might add to the picture painted of this man that polarizes America to the degree he does.