Another SJW trait of Spoony's; the inability to see shades of gray in anything. Robert E. Lee was a complex man- a man who grew up in a world where slavery was normal. Lee pretty much viewed slaves as subhumans and thought Law, Order and a functioning society were more valuable than Equality. Which were pretty much the views of most Plantation Owners of that time. (Lee also did do some dickish things like having slaves whipped and breaking up families, which were among his greater moral failings.)
Lee did think that Emancipation should happen at some point in history, (as he viewed slavery as a moral evil.) But he was a bit optimistic in thinking that it would happen gradually, without any kind of political force or violence. Lee was an utter conformist, taking no dramatic stands on pretty much anything, but trying to uphold the status quo. He might not even have been as good a general as his legends make him out to be, as many of his battle tactics were aggressive and ended in heavy casualties for his side.
When victory came, Lee tried his best to make the surrender go as smoothly as possible. He even (ironically, as it would turn out,) opposed the erection of war monuments, since he thought it would prevent the healing of the country. It wasn't really Lee's fault that his dignity and stoic demeanor made him a romantic figure for defeated Southerners, who put him on a pedestal and portrayed him as a paragon of honor. Lee was one of those public figures who was neither better nor worse than anyone else in his station. Spoony, of course, would have been right to point out Lee's failings and how badly the guy has been overhyped. But instead, Spoony decides to paint him as A LITERAL NAZEE, and anyone trying to examine the man and point out the complexity of his character as NAZEE ENABLERS!!!! Which is funny, because I don't recall hearing about General Lee marching black people into gas chambers or having them mowed down with machine gun fire. Once again, the word "Nazi" is being used as a black brush to wipe away any trace of nuance, and thus, destroying any chance of looking deeply into the motivations and mechanisms behind slavery, and learning what could have been done to end it a lot sooner (and a lot less bloodily) than it could have been ended.