Trump is not a racist and your accusation is simply slanderous. If true slander is a sin and must be confessed. 

If you were the type of person that went on and on about how people in the past did this and that to you, you would be the most boring person in the world. This would preclude you from having friends. This is because people know that obsessively dwelling on the past is a real turn-off. This is because it does no good, is a waste of time and we should all get over past sins  and move into a positive and bright future. This is what Christ teaches.