No, I'm not upset over a picture, I'm just pointing out the bad information of the meme. Ya know, if you wanted to be most correct, you could say "a bunch of people who neither fought for the Union nor the Confederacy." One isn't going to win over opposing viewpoints by placing blame so specifically (especially when most of the people actually fighting weren't people of color). That meme plays this up as Black Vs White, rather than a difference of ideologies.
That sounds an awful lot like the same argument against "Black Lives Matter".