I mean... I thought so in 2016, but four years later, I simply do not believe this. There is no evidence to support this. He has constantly condemned white supremacy. He obviously is a nationalist, but for America, being a multi-racial nation, saying one is a nationalist does not mean you are a racist.
Trump has delivered insane results for minority groups, and has done things even supposed 'progressive' candidates wouldn't do. All this has convinced me that the man is clearly not a racist, despite constant claims otherwise.
Also, I suppose I am somewhat immune to the racism claims against trump. My parents are immigrants, as is my entire family. My parents were the first ones on the Trump bandwagon in 2016, followed by the rest of my family. I thought they had gone off their rocker and thought the man was nuts, despite being a Republican leaning voter. I voted against him in 2016. I thought he was clearly a racist and would hurt immigrants, like my uncle. However, Trump became president, and my uncle's case suddenly went faster. All this talk about how he was delaying immigration simply didn't pan out for anyone in my family. My uncle became a citizen a few years ago, and now the entire family is voting Trump. My sister-in-law (who is Hispanic) is also voting Trump, along with a bunch of her family. They didn't 4 years ago.
Funnily, enough, most of my friends growing up (who are mostly non-white) are either Trump voters or are okay with Trump (like they do not believe people who vote for him are racist). I do have friends who believe that all Trump voters are nuts, and they are mostly the white friends I made in my super-elite college. I do have non-white friends from college who are also against Trump, but given how few non-whites there are in elite colleges to begin with, that's the minority for me.. Even more amazingly, despite my own immigrant family and my sister-in-law's supporting Trump, the only family I have that is rabidly anti-Trump are my white relatives (who are more highly educated than anyone in my non-white family, I suppose).
The fact is Hacker News and most of these elite media outlets cater to an audience of mostly white, educated, coastal liberals. Their experiences do not match the reality of every day Americans, including black and brown and immigrant ones. I would not be surprised to see massive black and brown turnout for Trump. Perhaps not majorities, but enough to give the democrats real cause for concern.