And what color did europeans think prester john was? Racism is internalized much like gender roles are, and this internalization exists entirely within white people, it has always existed even before colonialism put a name towards it, to claim that racism began during colonialism is to deny the existence of white and black people itself. Black people exist, they are a culture and a race and in need of preservation and whites have always sought the destruction of blacks. I recommend you read the works of Wallace Fard Muhammad to educate yourself on history of white people pre-colonialization.