I have yet to see a single example of Trump's racism. It's an oft repeated cliche that has yet to be demonstrated by anyone. As much of a "clown" as trump might be, half of his labels are completely pulled out of thin air.
He spent 5 years pushing the birther conspiracy even after Obama produced his birth certificate. He also implied that Obama was a Muslim despite his claims to the contrary.
He's implied several times that Obama sides with terrorists because of his upbringing.
He said a judge was unqualified to preside over a Trump University lawsuit because he was Mexican (turns out he was born in the US 60 years ago.) Paul Ryan called it a "textbook definition of racism".
He started his campaign with this quote: "When Mexico sends its people, they’re not sending their best. They’re not sending you. They’re not sending you. They’re sending people that have lots of problems, and they’re bringing those problems with us. They’re bringing drugs. They’re bringing crime. They’re rapists. And some, I assume, are good people." Despite the fact that studies show first generation immigrants don't commit more crimes than native born citizens.
He uses language like "My African American", "The Muslims", and "The Hispanics" when talking about minority groups.
He refused to disavow David Duke on air until he "researched him more." He said he didn't know who he was, but it turns out there are numerous example of him mentioning David Duke in the past. He had primaries in southern states coming up, so publicly disavowing David Duke would have likely hurt him. Especially since David Duke has been campaigning for him. He did eventually disavow him after the media made a huge deal about it.
He repeatedly refers to Elizabeth Warren as "Pocahontas".
He said "They don’t look like Indians to me" about a Native American tribe that ran a competing casino.
He said "Maybe [the protester] should have been roughed up,” he mused. “It was absolutely disgusting what he was doing." about a Black Lives matter protester at his rally.
He said "I will say that people who are following me are very passionate,” Trump said. “They love this country and they want this country to be great again. They are passionate." when asked about supporters who beat a homeless Latino man because "they all need to be deported."