Yugoslavian culture is amazing. My parents lived in Yugoslavia they and all other relatives that lived there say that it is the best times of their lives.
It is called: Bratstvo i jedinstveno (Brotherhood and equality)
Surely that's at least in part just because of the contrast to the bloodshed and absolute savagery that followed when Yugoslavia splintered and the erstwhile Serb, Croat and Bosnian brothers started murdering each other?
No - it was an authoritarian regime but there was also a genuine belief in the Yugoslav project. It wouldn't have lasted as long as it did without that, it wasn't just sloganeering and coercion.