It would be a logical next step if what they hate is really slave-owners, but in the case of Egypt, American liberals would likely claim that the relatively dark-skin color of Egyptians removes them from the judgment heaped on people with white skin color, so the dark-skinned Egyptians cannot be considered by the same standards white Americans are judged and labeled. Typical liberal-speak.
The truth of the matter is that the Pyramids were built with slave labor to be monuments celebrating the current or just-deceased former Pharaoh, so they were indeed slave owners, and slavery is color blind.
In fact, throughout history slavery was more common for a majority of people and nations throughout the world than freedom. All of the kingdoms in medieval times had serfs who were effectively slaves to the monarch. No one had the liberty to relocate from their assigned village and their assigned field which they were expected to cultivate and pay taxes on. The legend of Robin Hood was of someone who fought the dictates of the monarch , which the common people of England could not escape.
In the United States there were thousands of free blacks who owned slaves and profited from having them, and the American Indians enslaved enemy tribes that they conquered, including white settlers they picked up and enslaved along the way. When you consider the amount of slavery currently occurring in eastern Africa at this current time, and the suffering that results from it, it’s amazing how much emphasis American liberals place on the America of 150 years ago and how they assign blame to current citizens of the United States and for old Confederate monuments, for what happened in the distant past. But it’s a radical liberal thing, and no sensible person would understand.