The problem for creationists is that while Darwin asserted that all humans were related and all deserved freedom and the right to the fruits of their own labor, creationists until very recently often called for some races to be deprived of even the right to vote. In the 1990s, ICR co-founder Henry Morris declared that black people were intellectually and spiritually inferior to other races, and one of his co-founders, Dr. Tinkel, was an enthusiastic eugenicist. Hitler later took the views of eugenicists to produce his "final solution." (details on request) Darwin asserted that if a "primitive tribe" were taken to England, that in a few generations they'd be identical to Englishmen, an assertion that outraged creationists of the day.
Not all of them, though. Even then, there were creationists who objected to racism as Darwin did. Samuel Wilberforce, the cleric who lost a major debate on evolution with Thomas Huxley, joined with Darwin in opposing slavery. Sadly, many creationists in America supported slavery and then segregation after they lost the Civil War. Darwin's position was pretty much the same as Lincoln's, except that Darwin was confident that "primitive" races could develop in a short time to accomplish as much as Europeans.
Like many people of European descent at that time, Darwin thought that Europeans were superior to other peoples. Where he differed from most creationists, was in recognizing that all people were essentially alike in their ability to learn and develop and in having rights. The last world-class biologist who denied Darwin's findings,(Agassiz) even argued that whites and blacks didn't have a common ancestor.
Modern evolutionary theory has shown that there are no biological human races today. Most, but not all creationists have now accepted this fact.