This so-called traditional definition returns too many false negatives. It would exclude, for example, the inflammatory newspapers of the Jim Crow era. Americans learned with tragic regularity in the Post-Reconstruction era why spreading racial rumors is so reckless. It doesn’t matter to the moral calculus that the rumors were "truthy." The norm against expressing racial prejudice predates the most recent party realignment; it's amply represented in WW2 training materials. This is not a new thing.