Why would I laugh? My impression is that that the UN has remained a terrain of struggle, even as that struggle was marginalized under US hegemony.
The PRC has consistently outlined what kind of international order they are trying to build to replace the imperialist world order, and how they intend to build it: namely, an international order based on mutual sovereignty rather than hegemony, with a materialist framework for human rights rather than a culturalist one. As US hegemony crumbles, I can't think of any good reason to abandon the ground that it's ceding in the UN.
on here equivocating about how, since it was a liberal welfare state, its dissolution might actually be a good thing for the people losing food and housing?
But the UN exists in a very different context than parliament, and China denouncing the UN would neither smash nor replace it.
The UN has contained proletarian states since its founding, in which the USSR played a major role. What has given the UN its bourgeois character has not been its form as a suprastate apparatus, but its content of bourgeois states. As the content and character of not just the UN but of the world have been determined by hegemonic imperialism, it is this hegemony that must be dismantled in order to make conditions capable of sustaining international revolutionary solidarity instead of crushing and subverting it.