If this is the circumstance of this particular movie, then I am in agreement that it should be boycotted by African Americans.
I would like to take it further and say that I already do boycott any films, etc., that depict African Americans in an unwarranted negative light. I think that African Americans should also boycott any movies made with African Americans starring in them or even with bit parts or any made by African Americans as well that continue to subliminally or overtly convey a message that all of the negative stero-types are the norm for African Americans.
When ever I am watching a movie, etc., and I see that the only "prostitute" has to be a black woman, or that the "criminal" has to be a young black male, or the black person(s) has to be the drug addict or drug dealer or the rapist or the thief, then I turn it off---click! and the same goes for movies that come the theaters--I do not go to see them; I do not rent them, etc. (However, I will make exceptions for comedy because comedians and comedy stereo-types everyone and with it being comedy there is no inference that it would be taken seriously).