“Israeli troops and settlers withdrew from Gaza”

Yet it remains very much occupied under the law.

Israel did pull the settlers out, as was its legal obligation, but it only did so in order to turn Gaza into the world's largest open-air prison, to divide the Palestinians and undermine their resistance while focusing on the rapid expansion of illegal settlements in the Occupied West Bank – where it quickly moved more settlers than it had pulled from Gaza -  designed to prevent Palestinian statehood. 

How Israel brought Gaza to the brink of humanitarian catastrophe 
Avi Shlaim
http://www.guardian.co.uk/world/2009/jan/07/gaza-israel-palestine 

“Israel disagrees”

No it doesn’t. 

It simply disregards the law, has made a conscious choice to defy the UNSC, and has been allowed to get away with this for decades.