Because we are 145 years removed from slavery and 40 years removed from segregation. I had nothing to do with either, nor did my family, and for you to lump me in with people that did simply because of the color of my skin makes you as bad as the people responsible for those terrible times. In fact, it probably makes you worse because you have history to learn from and failed to take the lesson.
Expecting me to take the blame for another person's actions is out of line and not going to happen. There are nations with black armies that rape, murder and maime other black men, women, and children. Should I judge you by their actions because of the color of your skin and the title, "African-American", even though you have no relation to those responsible? Should I play the "rapist/murderer" card on you because you happen to be black like those people, or would you rather I judge on on YOUR actions?