Awesome question. The USSR too had its own perspective of the worlsd and I think (at least from the 1950s, possibly earlier) it too was threefold - the imperialist camp, the socialist camp and the colonial, developing or broadly non-aligned remainder, though there was no explicit ranking.

The Soviet model is complicated by its differentiation of government and people - while Pinochet's Chilean regime might be beyond the pale even to western bourgeois liberals, its population nevertheless constituted a country in struggle against imperialism. The same goes doubly for a polity like South Vietnam. As for China, its status I think remained unresolved in the 1960s-80s as relations collapsed and then resumed on a more state-to-state basis.

"Us/Them/Uninvolved" actually isn't a bad representation.