Racism is a massive, very complex issue. Racists are people who have been indoctrinated, sometimes during a lifetime, by loved ones, friends, or via negative experience. Racists will require a careful approach in order to open up their minds to let them place trust in persons from other races.
Minority races, especially former 'slave' races, are often laden with trauma from long gone generations. They also must be aproached with care and respect when seeking a common ground.