Recall that Trump lied about Muslim celebrations in NJ after 9-11. He also took out racially inflammatory ads in NYC in the rape of a female Central Park jogger. Even after DNA evidence and a confession cleared the accused black & Latino yutes, Trump continued to insist they were guilty.
https://www.nbcnews.com/politics/2016-election/donald-trump-says-central-park-five-are-guilty-despite-dna-n661941

I also trust the nazis and kkk to know one of their own, and he has their support. As my dad used to say: Tell me your friends and I'll tell you who you are.

Trump is a racist. He's certainly not above exploiting that fact with his base--what does that say about them?--but he has a longer history of racism than his time in politics.