@High Strangeness,
Trump has shown he is a racist by a variety of comments. Concerning Mexicans, he has said immigrants bring crime when numbers show that crime among the immigrant community is about half of what it is for native born citizens. He has said a judge is unfit for his job because he is of Mexican descent (even though he was US born and a citizen). Concerning African Americans, he has said they are lazy due to genetics and that they are responsible for 82% of white murders (taken from a white supremacist posting). He has been sued by the Justice Department for illegally refusing housing to minorities and was very outspoken in railroading the Central Park Five. He has repeatedly called a sitting US senator by a Native American slur, most recently today. He's posted another tweet with anti-Jewish overtones.
Trump has only been consistent on one topic over the last thirty years or so. He was for the Iraq War, now he is against it. He was pro-Choice, now anti-abortion. He called for more taxes on the rich but now wants to give them a huge tax cut. But on racism, he has been remarkably constant. It is truly his one defining feature.