The NFL, NBA, Jamille, Puerto Rico, Latino's, blacks, black soldier, you name the color brown, he's got issues with it.
Now lets wait on the attack tweets.
The thing is, I think Trump's realized he can get away with anything as long as he panders to the alt-right, the Nazis, the Confederate treason flag waving people, all of these cooky right wing groups, and he knows what gets them his support and what they'll be willing to ignore.
On manipulating these people he's rather good. And often this means going against blacks.
Whether he actually agrees with this stuff I don't know. I do know the most important person to Trump is Trump, he'll do anything to make himself feel important.