Trump said Curiel was not going to be impartial because he was “Mexican.”
^ from the article. That is not "racist". The right to a fair and impartial judge is sacrosanct. Its asking the question if the judge can be impartial.
If that's the best example, and it appears so...you have failed.
I have filed motions to disqualify for race, religion, and other reasons. Not with any was I deemed a "racist" or other negative designation. And most motions were granted. There is nothing wrong with bringing up race of a judge when questioning if the judge can be impartial or have the appearance of being impartial.
To call Trump a racist for this shows the lack of RA's knowledge of such subject matter