You are right, and the DNA record shows that we all came from the same parents, are of one race, the human race, are all related, and that differences in people are genetic and not racial.
No. That's what racists will tell you, but it's wrong. There are no genetic human races. There is more genetic variability in any "race" you might define than there is between them.
In actual fact, evolution is totally responsible for racism,
No, for the reason I just showed you. Evolutionary theory has shown that there are no biological human races, but into the 1990s, creationists like ICR director Henry Morris was still blathering about the supposed intellectual and spiritual inferiority of black people:
Yet the prophecy again has its obverse side. Somehow they have only gone so far and no farther. The Japhethites and Semites have, sooner or later, taken over their territories, and their inventions, and then developed them and utilized them for their own enlargement. Often the Hamites, especially the Negroes, have become actual personal servants or even slaves to the others. Possessed of a genetic character concerned mainly with mundane matters, they have eventually been displaced by the intellectual and philosophical acumen of the Japhethites and the religious zeal of the Semites.
Institute for Creation Research director Henry Morris, The Beginning of the World, Second Edition (1991), pp. 147-148:
At a time when Darwinists like Punnett had completely debunked eugenics, showing it to be scientificially unsupportable, prominent creationists like William J. Tinkle, co-founder of the Creation Research Society, was an enthusiastic supporter, even arguing against letting "inferior humans" reproduce.
At the present time there are in the United States more than a million people with serious hereditary defects, and to reduce their numbers by even a few thousand would reduce the amount of discomfort and hardship in the future. Unfortunate births are reduced by segregation also but there are not enough institutions to house nearly all the ones who have unfortunate genes. Institutional care is expensive but as compared to total government expenditure it is small.
Sterilization is sometimes employed with the consent of the patient for non-eugenic purposes. An example is a woman who has borne three children by Caesarean section and could not stand another birth. Persons who are on the borderline of normal mentality may be able to marry and care for themselves but would not be good parents. Their children might be normal or might be defective, and at any rate would have poor home discipline. Such persons sometimes are prevailed upon to submit to sterilization, to their own advantage.
William J. Tinkle, Heredity. A study in science and the Bible, 1967
This is not to say that all YE creationists are racists and eugenicists. Most are not. It merely demonstrates that racism among the YE creationist leadership has been a problem at a time when evolutionary theory has debunked both racism and eugenics.