Dexcendents of Egyptian slaves are all dead. Jim Crow was still the law 54 years ago. You still have people alive who witnessed it.
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And Robert E Lee was not as honorable as you'd like to think. Yes, he called slavery "a moral and policital evil" but for a different reason. He wrote:
"I think it however a greater evil to the white man than to the black race, & while my feelings are strongly enlisted in behalf of the latter, my sympathies are more strong for the former. The blacks are immeasurably better off here than in Africa, morally, socially & physically. The painful discipline they are undergoing, is necessary for their instruction as a race, & I hope will prepare & lead them to better things. How long their subjugation may be necessary is known & ordered by a wise Merciful Providence. Their emancipation will sooner result from the mild & melting influence of Christianity, than the storms & tempests of fiery Controversy."
https://www.theatlantic.com/politics/archive/2017/06/the-myth-of-the-kindly-general-lee/529038/