Regardless of the author's success or failure to convince you of it, the D Trump is ugely racist towards black people: he was found guilty of having taken measures to exclude black people from living in his buildings.  He said to a reporter that one of his black casino employees was lazy because "laziness is a trait in blacks"  and any time he visited his casinos black employees were ordered off the floor.  Of course throughout his entire campaign he also kept the alt-right close at hand and exploited Obama's African heritage as grounds to question his birth certificate, encouraged violence against black protesters at his rallies.  But those last few are slightly more circumstantial than the direct examples preceding them.