IMHO:  It is likely Trump actually believes that he's not racist, but his offhand remarks throughout his life says different. Trump IS a racist.

"On MLK Day, U.S. grapples with furor over Trump’s words" PBS NewsHour 1/15/2018

Excerpt

SUMMARY:  This year's memorials honoring Martin Luther King Jr. came amid the ongoing furor over President Trump's alleged comments and his views on race.  While the President released a video commemorating the civil rights hero, his derogatory words reported last week about African and Haitian immigrants hang in the air, as partisan acrimony threatens hope of a DACA deal.  Judy Woodruff reports.

"Jelani Cobb: ‘It’s impossible to avoid the conclusion that Donald Trump is racist’" PBS NewsHour 1/15/2018

Excerpt

SUMMARY:  President Trump's recent reported use of vulgar language to describe some immigrants has prompted backlash from both the right and left.  It also raises questions about his own personal history on issues of race, and how his perspective affects the nation.  Judy Woodruff gets reaction and analysis from Peter Wehner of the Ethics and Public Policy Center and Jelani Cobb of The New Yorker.

Peter Wehner, lifelong Republican: Yes, I do believe that he used these words.  I don’t think there is much question about it.

Republicans like Lindsey Graham have confirmed that he used it.  And this is all part of a piece with him.  This is the latest link in a long, malicious chain for Donald Trump, a chain that’s connected by racist sentiments toward Mexicans, toward Muslims, and toward African-Americans.

In terms of what it says about him and how I interpret it as a lifelong Republican, it’s extremely painful, it’s revealing.  And what it says about Donald Trump and about Trump supporters is that they are racist or that they find great appeal in racist sentiments and expressions of racial division.

You know, Donald Trump is appealing to the worst instincts of America and, unfortunately, his supporters are responding to it.