I mean, it has been applied as a way to divide, like when Bernie proposed all sorts of policies to help the poor and mainstream media ran with "but what does Bernie do specifically for poor black people?"
That's not to say there aren't such specific concerns, but it wasn't like Hillary was doing any better in that regard. It was solely used as a way to make Bernie look less progressive. So instead we got Trump with the simple and straightforward "make america great again".
Fighting a war on multiple fronts is a great way to stretch your resources thin and muddy the strategy.