Let's assume in his own mind Trump is racist as fuck and hates black people. He is just pissed that the law forces him to hire them and lease them building space.
Ok...
Find me evidence that in the last 20 years he has let that bleed over into how he has ran his business. There should be very strong evidence he has discriminated against black folks.
If I thought for one second trump would treat many Americans unfairly i wouldn't for one second think about voting for him.
The president is not above the law. Even if he wanted to he would have a very difficult time in discriminating with the level of scrutiny he is under at that level.
And I know from my own life that people are often very capable of making decisions and taking actions that are against their own personal beliefs and views. Racists can choose not to act racistly. What I'm talking about is as a christian I know homosexuality is a sin. But when it came on the ballot in my state I voted for marriage equality. I've subsequently become an atheist but at the time I was a serious christian. It didn't stop me from recognizing what was fair.
And given that his opportunity to do harm in that regard is so small with today's attitudes it isn't worth worrying about.