Most of the chants [at a Ft. Lauderdale protest] were run-of-the-mill; men and women waving Palestinian flags called Israel's invasion of Gaza a "crime," while the pro-Israel group carried signs calling the Hamas-run territory a "terror state."

But as the protest continued and crowds grew, one woman in a hijab began to shout curses and slurs that shocked Jewish activists in the city, which has a sizable Jewish population.

"Go back to the oven," she shouted, calling for the counter-protesters to die in the manner that the Nazis used to exterminate Jews during the Holocaust.