I think the problem here is that many people who are "classist" get mixed in with racists. Because many many people who are racists are also classists. Also many people of color are trapped in a vicious cycle of poverty. So, it can certainly seem like if you hate poor people you are racist, because most poor people are black.
I think the closest he has come to true racism is calling some countries shitholes. Those places are almost all people of other colors.
I'm pretty sure Trump is classist, and 100% positive he is an asshole, but as for racist? Only in that tangential way I mentioned above.