"The neo-Nazis and the KKK are a lunatic fringe who influence virtually no one."

   Exactly.
   Because the biggest source of hatred in our society has been downshifted from race, religion and political ideology to the real visceral everyday economic disparity between the haves and have nots.
  It's now perfectly approved by society to hate the poor. But the hatred needs to be in the form of subtle informed indifferent ignorance, latent not blatant, covert not overt, under the political radar, or, as in the case of Trump's unemployed struggling millions, effectively linked to blatant hate groups like white supremacists.