As it’s already been said, call the police first and gave a report filed. Then with the police have them issue a cease and desist order against the nutjob who called you and your son that vulgar term: state to the police that with how the man intimidated you and your child and displayed a threatening tone along with a desire to cause bodily harm, you are very afraid of your livelihood and for your family.

Don’t be a coward; fight back with action as suggested above; moving away from the incident solves absolutely nothing but will allow the black hating man the victory he badly wants to see you and your family leave when in reality and truth you all are the victims of harassment; NOT him; I suggest you let the police know the black man is being racist and discriminatory as well; learn to use their owns words AGAINST them each and every day.