It sounds like post traumatic strees to me . It will pass though time , associating with black people would help time after time ... Maybe also talking about that experience .... I once knew someone who had been raped by a black man and started hating them and see them as a threat and she went to live in an area with black people and got over it " The black man who raped me" became " the man who raped me" as she stopped assosiating the colour with threat.