Automatic Racism

In class we did an activity in which someone did a computer activity to show there automatic reactions and distinctions that are made between "blacks and whites".It was crazy to see that automatically there was an unconscious preference of "whites," to "blacks". As we read further we learned that this preference even consists amongst "blacks." A study at the University of Washington furthered the evidence to this....it is possible to be racist without knowing it! Americans stereotypes and prejudices operate unconsciously! This seems as though it happens because of the culture we grow up in....how can we be completely unprejudiced, assuming we cannot just change American culture and views overnight?