Lee was a traitor to his country and a defender of slavery. Grant was not. Lee accepted defeat, but he live quite well, attended to by Black servants. He told people that he did not want any statues or monuments, and until he died, there were none.
The Civil War began as a conflict mostly about lifestyle and economic interests, but within a couple of years become about slavery, which was the most important conflict affecting lifestyle and economics.
Neither Obama nor Kamala owned slaves or defended the goddamned Confederacy. No one chooses their ancestors or even their parents. If you are so dumb you do not understand that, you are totally worthless as a judge of character