Trump has made a number of racist comments. For some people, a single such comment is enough prove he is a racist. For others, no amount of racist remarks deserves the label. Asking for people to prove Trump is a racist is as silly asking people to prove he's evil, bad tempered, or narcissistic.
And that's my point: You can't
prove Trump a racist, you can only
call him a racist. Why no proof? Because there isn't any.
The few incidents cited prove nothing other than the hatred of those who use them for examples. Millions of people have disagreed with members of another race, brought suits against them, or fought with them. This doesn't make them racist.