Class comes last. I agree that the intersection of class and other group identities is a fact. I would still say that the poor, as a group, come last. You will find course requirements, programs, departments for every kind of group identity. But look for the poor. Where are they? You are right that they are hidden in the other categories. But what is the most important privilege in the end but the privilege to avoid avoidable suffering? Where are the poor? They are as invisible as children, the most frequent victims of violence.

I do disagree about why people voted for Trump. You believe that they use less mental effort than the rest of us and act out of ignorance more than we do. I don't believe that taking a superior position like that leads to understanding people who are different from us. I would take a different route. Joan Williams sets out a good approach here: https://hbr.org/2016/11/what-so-many-people-dont-get-about-the-u-s-working-class