OK, what is the evidence that Trump's electorate is motivated primarily by racist-style populism, that this is more important than economic populism?
The way I see it, there are several overlapping groups.
1. People who vote GOP in principle, or are single-issue voters (such as on abortion).
2. People who see Trump as embodying a racist message and approve of it.
3. People who are attracted by economic protectionism and strong anti-immigration positions for economic reasons (this would be the obvious factor for the working class).
4. People who really hate Clinton and the political establishment in general (this would include Sanders supporters who voted for Trump.)
5,. People who think the US gets too involved in overseas matters.
8... there are probably more
Untangling all these reasons is very complicated. "People support Trump because they are racist" is just facile and lazy, and it's going to make problems even worse because underlying issues are not being addressed.