Identifying African behavior as stereotypical is dangerous stuff. I've learned from experience to issue caveats about most any racial or ethnic stereotype, admit to stereotyping and beg forgiveness--especially before using an ethnic or racial stereotype. Even then, you're liable to have to push through assumptions, in spite of the fact that the use of stereotype can be highly valuable for explaining behavior.
However, one of my young friends recently expressed his frustration at Nigerian and Somali friends who call to say they're in town and want to go out for a drink the same night. After experiencing this behavior on numerous occasions, he asked why they don't ever give him advance notice so that he won't have to reschedule his time to meet with them. They both responded, "It’s just African." In our diverse culture that kind of...