I have an unusual background to comment on the racism of Donald Trump. I worked in Mexico City for a year and a half as a database consultant. I came away from that experience with the knowledge that Mexicans are, on the whole, honest, hard-working, intelligent people. Later, when I first retired, I moved to live in Xonghile Game Park, a private game park in Mozambique. I came away from that experience with the knowledge that Africans are, on the whole, honest, hard-working, intelligent people.
Note that I say ‘on the whole’ because any country or ethnic group will contain people who are dishonest, lazy, or unintelligent. Which is the same thing as saying they are comprised of human beings in all their glorious, and inglorious, variations.
What the racists do is to point out that some blacks are unintelligent and proclaim that all blacks are dumb, or that some Mexicans are violent and say that all Mexicans are violent, all the while ignoring the unintelligent, lazy, violent whites in their midst.