Here is some further reading for you. Look up the battle of Fort Pillow, April 12, 1864. Also after helping to found the KKK, I'm sure NBF only wanted to scare the black population.
About Fort Pilllow:
A Yankee Congressional investigation found that the black soldiers trying to flee to the Union gunboats under the bluff
blundered into the two Southern companies sent to prevent a Northern landing & after failing to surrender;
they made the fatal error of firing on troops protected by ravines on both sides of them. Of course they were cut to shreds...
Forrest was tried because of the Fort Pillow incident but proven Innocent.
As to Forrest's relationship with African Americans know this:
When the war started, Forrest asked 45 of his slaves (which he considered as servants) to join him, offering them
their freedom after the war, no matter how it turned out. They all joined him and although they had numerous
opportunities to desert him, 44 stayed by his side until the end of the war. In fact, part of his special command escort later
called "the green berets" (ironic isn't it), consisted of the most elite and best soldiers available, and among them were eight black men.
Forrest said of the black men who served under him, "These boys stayed with me.. - and better Confederates did not live.
2 black men road with him the entire war. Napoleon Nelson and Nim Wilkes were their names.
So you question the fact that NBF is considered the finest cavalry commander either horse or mechanized
ever born on American soil, & consume yourself with a problematic disputable episode in his career.