This is nonsense, the Palestinians and Palestinian organizations - even including Hamas - have to varying degrees accepted or shown willingness to accept a Palestinian state that does not encompass all of Mandatory Palestine. Israel is unwilling to have a two state solution, they always desired all of Mandatory Palestine and saw any division plan only as stepping stone for further expansion in the future.

The UN General Assembly does not make legally binding decisions, they express majority opinions. Only the Security Council can make legally binding decisions. There is also the question whether the UN General Assembly even has the legitimation to suggest the partitioning of some land against the will of its population. There was an attempt to decide on this but that did not get the necessary votes. And even the partition plan was only accepted because several countries where pressured or incentivized to vote for it.