Israel knows that the US will back it up no matter what, so it doesn't have to listen.
Blinken also knows that Israel knows. The US calls for humanitarian aid, etc, are public theatre designed to be rebuffed by Israel without consequences. So Biden gets to show the world that he is very concerned over human rights, even as Israel flattens Gaza.
Between the unflinching support of the US, the world doing nothing to stop genocide across the globe, and the lack of any consequence for nuclear powers, they know they have basically carte blanche.