What did Jesus Christ think about racists?

Unfortunately Christ did not speak directly on Racists and bigots, typically like Donald Trump and most of his supporters, but he did express that we should treat one another fairly and without prejudice. 

Fake Christians who believe in Trump and his hate will never be accepted into GOD's kingdom after this life. 

He told us that we are to love all people, even our enemies, just as He does. How would you feel about someone who hates members of your family? That's how God feels about those who hate members of His family, the human race.

He was not a racist. (Matthew 22:37-39) He said to him: “‘You must love Jehovah your God with your whole heart and with your whole soul and with your whole mind.’ 38 This is the greatest and first commandment. 39 The second, like it, is this: ‘You must love your neighbor as yourself.’

“Any kind of social or cultural discrimination in basic personal rights on the grounds of sex, race, color, social conditions, language or religion, must be curbed and eradicated as incompatible with God's design.”—
Gaudium et Spes (“The Church in the Modern World”), Vatican II, 1965, #29.

Acts 10:34, 35 : "At this Peter began to speak, and he said: “Now I truly understand that God is not partial, but in every nation the man who fears him and does what is right is acceptable to him."

I think the best example of Jesus rebuking racism in the New Testament is his parable of "The Good Samaritan." The Samaritans were a non-Jewish ethnoreligious group within Judea and the object of much prejudice from Jews. The parable, which he preached to fellow Jews, casting a Samaritan as the hero, for a good-for-nothing Samaritan could never be a hero, after Jews had beaten up the traveler and other Jews had walked by and left him to die was, aside from being an example for how to treat our fellowman, a rebuke of that racism.

Jesus taught his followers a fundamental principle that underlies our unity. “All of you are brothers,” he said. (Read Matthew 23:8, 9.) Of course, one sense in which we are “brothers” is that all of us have descended from Adam. (Acts 17:26)   In addition, they had become members of one large spiritual family, united by love and faith. Thus in their letters, the apostles often referred to fellow disciples as ‘brothers and sisters.’
After making it clear that we should view one another as brothers and sisters, Jesus stressed the need for humility. (Read Matthew 23:11, 12.

Jesus Christ died for ALL mankind. That is in spite of what race you are. That speaks for itself that he is not racist. 

Christ led by examples, and treated all as God's children (cured everyone alike).

Normally, you only get to choose one hill to die on... He should have been able to manage two or three.

He was a racist.
 26 The woman was a Greek, born in Syrian Phoenicia. She begged Jesus to drive the demon out of her daughter.
27 “First let the children eat all they want,” he told her, “for it is not right to take the children’s bread and toss it to the dogs.”