It was orders exactly like Trump's that the South's leading general fought most against. He was a statesman, and fought the war more for his home state of Virginia than anything else.
The precedent you suggest is a very dangerous one, and also is generalized. To say that most of the monuments are to glorify something is false. The memorials around Gettysburg, Manassas, etc. do not glorify anything. They represent the tragic and extreme loss of life (on both sides) and are definitely somber reminders of the past. Yes, there are statues of Confederate generals all over the south. And their names are not just on the statues, they are on buildings, libraries, schools, roads, and countless other pieces of integral infrastructure. To erase all that would be to erase an entire region and history, which is the real point I'm trying to make. Those generals were not all perfect and some fought for the wrong reasons, as with any war. But most fought with the same conviction that Lee did, against federal imposition. If anything, the memorials should stand as a reminder of just how bad things can and will get if this current unrest continues. I feel it is folly to ignore these things and act as though they never happened, erasing the history, or per my meme the memories.
I also fault our schools for teaching only that the war was fought over slavery. Ask any Civil War historian, or better yet research it for yourself, they will tell you it is much much more complex than that. It frustrates me to see that such a rich and tragic history has been boiled down into such a simpleton's cudgel to impose racism onto those who have long forgotten it.