A lot of people are butt-hurt that Cosby called out the black community for collectively dropping the ball, especially in the time periods since Brown v. board of Education and the Civil Rights Movement. Although systematic racism and discrimination plays a huge role in the black community's current state and dysfunction, Cosby was right for calling us all out and begging us to take personal responsibility for our decisions (by going to school, speaking properly, dressing accordingly, treating ourselves with respect, etc.) instead of begging white society to change or solely relying on God.
Needless to say, this message didn't go over so well with many members of the black community (nor did it go down well with the white liberal media). A major reason why the speech didn't go down so well is because white conservatives have utilized Cosby's speech to slam the condition of the black community. To many people, there was very little difference between Cosby's speech and Bill O'Reilly's rant against minorities.
However, despite the harsh delivery of Cosby's speech, one cannot validly argue that Cosby was lying or that he wanted to attack blacks. There was a great deal of unadulterated truth in his speech and the people who continue to hate on the substance of his speech obviously had their nerves struck (or are even guilty of what Cosby was speaking against).
At the very worst, Cosby's delivery was rude and judgmental. But the most objective person would find that the substance of his speech was nothing but the truth. Some don't like the truth, though.