From what I've heard the extreme racism is generalized in the Mainstream Press in Israel, so I'm not sure that it's the Social Media that's making Genocide along ethnic lines be more broadly accepted there than it was in Nazi Germany.

That said, the fables in Israel around "The Jewish People" and its identity with the Palestinians as "antagonists", have been spun for far longer and the antagonism has been going on for far longer (since the creation of the state of Israel) than the ones in Nazi Germany with Jews as "antagonist", so maybe the much longer time (about 70 years) during which Israelis have been indoctrinated about their own ethnic superiority and the "antagonism" of Palestinians in Israel compared to the length of the similar indoctrination of the population in Nazi Germany, is the main cause for the more broad acceptance of Genocide amongst the populus in Israel than in Nazi Germany.

If you've grown up hearing about how you're part of a superior people ("God's chosen people") and Palestinians are The Enemy who hate you and want you dead, and your parents too grew up like that, you're probably far, far, more likely to be an extreme racist that trully believes themselves to be inherently superior and that Palestinians as not really human like themselves - hence having zero empathy for the suffering of Palestinians and maybe even relishing in it - than somebody who has only been exposed to similar shit for a decade or two.