The reaction to having a black stormtrooper had nothing to do with racism. It was a gut reaction that they were messing around with the universe as badly as George Lucas did. Previously they established that all stormtroopers were clones of a guy who wasn’t black. As long as they came up with a rational explanation of why a black man can be a storm trooper in this movie, I am fine with it. Just don’t mumble something about midichorines, or I want my damn money back.
Nope... All the Clone Troopers were slaughtered after Episode 3. Storm Troopers under the Empire were conscripts. And in the new movie, same thing. The "First Order" bad guys took young boys from their families and indoctrinated them and trained them to be storm troopers.