Its clearly not genocide, genocide has a very clear definition. If Israel wanted all the Palestinians dead they could do it in a few weeks.
America laid waste to Iraq and Afghanistan after 9/11, killing at least 250k people. That was not genocide and neither is what Israel is doing.
Saudi's killed 500k, using starvation as a weapon, that was likely genocide.
If you sneak across the border and murder, torture and rape 1000+ people there are going to be very bad consequences.
Note: I am in no way downplaying how much suffering the Palestinian civilians are experiencing. Its terrible. What I am saying is Hamas committed an atrocity and left Israel with no choice but to anhiliate them.