OK, so there's no real agreement on the role of Serb domination or whether it existed at all. But it seems that we have relyable data which imply that Croatia and Slovenia (or more generally speaking the northern part of Jugoslavia), were economically better off than the rest. As I stated above, most separatist movements and movements for more autonomy in Western Europe are based on a simple economic slogan: "Why should we pay for THEM?". This is the case in Spain, Italy, Belgium. It was the case in Scotland, the richer southern German parts demand more autonomy...
And it was basically the case in Jugoslavia.
To conclude, there's a "We against them"-sentiment. I think the "We against them" situation got out of hand because
-there are clear religious barriers along which the "We" and the "Them" can be grouped
-there already were historical barriers along which one could construct the "We" and the "Them"
-it may seemed that many of "Those" were in the ruling class
-foreign countries (Germany, Austria) were willing to accept separatism.
And it was basically the case in Jugoslavia.
To conclude, there's a "We against them"-sentiment. I think the "We against them" situation got out of hand because
-there are clear religious barriers along which the "We" and the "Them" can be grouped
-there already were historical barriers along which one could construct the "We" and the "Them"
-it may seemed that many of "Those" were in the ruling class
-foreign countries (Germany, Austria) were willing to accept separatism.