Well I can't speak for aborigines, but in america during slavery the ten percent rule was established because of the race mixing that went on between the slave owners and the slaves.
User Detail :
Name : Sherman, Gender : M, Sexual Orientation : Straight, Race : Black/African American, Religion : Christian, Age : 34, City : Richmond, State : CA Country : United States, Occupation : Contractor, Education level : Technical School, Social class : Middle class,  Racism cannot be wiped out because it's too deeply rooted in human nature. The only thing that we can do is try to recognize that we aren't perfect, try our best to rise above our petty prejudices and try to see each other as people. Remember that everyone is an individual and can't be lumped into categories.
User Detail :
Name : Sherman, Gender : M, Sexual Orientation : Straight, Race : Black/African American, Religion : Christian, Age : 34, City : Richmond, State : CA Country : United States, Occupation : Contractor, Education level : Technical School, Social class : Middle class,  You are right, that is a racist slur, but why is it surprising to you to find out that black people can be just as racist as white people? Whites do not have a monopoly on hatred or intolerance, but if that offends you, at least you can get a small feeling of the racism that minorities have had to suffer over the years.
User Detail :
Name : Sherman, Gender : M, Sexual Orientation : Straight, Race : Black/African American, Religion : Christian, Age : 34, City : Richmond, State : CA Country : United States, Occupation : Contractor, Education level : Technical School, Social class : Middle class,