I believe the response would be similar but not identical. There would be mass protests, just like there were in 2021, 2018, 2014, etc. I also participated in these protests. These protests would be smaller but still loud. Student movements would also call out their universities and demand boycott, just like in 2021, 2018, etc. But we probably wouldn’t see as many students participating, nor would it spread to as many school.
We would still see an ICJ case, however it wouldn’t be South Africa charging Israel of genocide. It would be the General Assembly charging Israel of apartheid. This case is also ongoing in our universe, and and was agreed to before Oct 7. Delegations would use that case to voice discontent with that universe’s version of the Gaza atrocities, no matter how scaled back it would be. But I think they would stop short of calling it a genocide (assuming Israel wouldn’t be committing one in that Universe). The security council would vote on a ceasefire and the US would veto it, just like in 2021, 2018, etc. The general assembly would also vote on and agree to to a ceasefire.
The BBC and Al Jazeera would quote statistics straight from the Hamas run Gaza health ministry, the BBC would say Hamas run, but Al Jazeera wouldn’t, just like in our universe. People would criticize BBC for that from both the left and the right (just like in our universe).
The truth about this universe is that Israel has been braking international humanitarian laws for a very long time, and the world is tired of it. In this alternative universe, the world would be equally tired of it, and would condemn Israel for it. Settler policies, apartheid, constant bombing campaigns in Gaza, constant raids on the West Bank, etc. all of that would be the reason the world would condemn Israel in your alternative universe. Israel’s settler colonial and apartheid policies would be a problem. And the accusations there of would be just.