I'd still like to know why people have trouble accepting that Ancient Egypt was Black?

Ancient (dynastic) Egypt was a "black" civilization. The people who began the dynastic period came from the south (East Africa) and their language was clearly African. Most Egyptian artwork shows a population with dark brown skin and curly to hair, just like most "black people" today. In Egyptian murals, you see Egyptians with typical African hairstyles as well (braided hair, afros etc). Thus, it shouldn't come as a surprise that people like Herodotus, Pliny, Aristotle etc described the Egyptians as having "black skin" and "woolly hair". Because Egypt sits at a crossroad between Asia and Africa, there was always an influx of different races in the area. But that does not change the fact that Egypt's origins were black. The population began to get much more mixed when the Hykos (Asiatics) invaded Egypt much later in Egypt's history. Subsequently, Egypt was conquered by many Asian and European powers, as well as Arabs who came after the dyanstic period had ended. Egyptians as a whole most likely resembled the people of the Horn of Africa today. Unless you want to call Ethiopians something other than "black", the dynastci Egyptians as a whole were certainly "black".