"Hate and anger are dragging us toward an abyss," he said at a dinner organized by the Simon Wiesenthal Center, a Jewish human rights organization. "Our politics, in particular, are now dominated by contempt."
"Hitler would have loved social media," he added. "It's the most powerful marketing tool an extremist could ever hope for."
"At its worst, social media allows evil to prey on troubled minds and lost souls," he said.
With a fierce campaign for the 2020 US presidential election expected in the coming months, Iger also stressed that it is "possible to argue policy without attacking people."
"I want to hear a pitch that isn't grounded in contempt of others," he said.
"I want to see a vision big enough to include everyone."