I hope I can help clarify this matter.
Why is it that Bibi is saying such harsh words against a UN declaration of Fakestinian statehood? Considering he is someone who gave Hebron to the Arabs and plans to expel over 100,000 Jews from their homes in a deal with Mahmoud Abbas the holocaust denier, shouldn't he support the UN's plan?
It is simple: Bibi (and the rest of the Israeli Pro-Oslo Suicide talking heads and traitor politicians) are against the UN declaration of the Fakestinian State, because Bibi and the Israelis want to be the ones to create this state. A UN declaration of statehood would be a "unilateral" move. But that thrashes the entire hopes of the Israeli Peace Suicide Process and explodes it in their faces. They cannot take credit for being the "good guys" that created an Arab homeland in the Jewish heartland. They cannot accept accolades and applause from the EU and the world. They cannot be rewarded by their USA backers and puppetmasters. The nascent state and its Fatah-Hamas govt will owe them nothing. And they cannot create such a state with their delusional goal for "on their own terms" controlled-suicide situation. It will be completely out of their control on ALL the terms which they wish to dictate to the Arabs about their state as part of the Oslo fantasy.
But in principle Bibi has no problem with a Fakestinian state if he can decide its borders, how many Jews he will expel to achieve it, and how many official (on the record) weapons shipments the new state will receive each year and from whom... etc and if the Israelis can take credit for it in the "international arena." They live with the delusion that their own creation of such a state will get the world of Israel's back. On the contrary, there is no reward to be had, no matter who creates it, and the state itself will have rockets and missiles and bombs pointed directly at Israel's heartland, poised to liberate all of "Palestine."