How do you then address global-scale issues without some kind of global-scale body though?
You can't address global scale problems through a global government in the current problem because people do not feel loyalty and responsibility to all of the world in equal measure. Hence global scale bodies will always favour the US, Russia, China, and other hegemones, just as the EU level body disproportionally favours Germany, France, or the UK. For a global body to work you'd also (you know, besides not being achievable in the reality of our reality) have to separate it from democratic procedure, and how great would that be?
I mean, I get it, you hate the EU
Sigh. As I have said many times before, no, I do not hate the EU. I do not want the EU to fail and/or disappear without a trace. I want the EU to change. But if you'd rather just dismiss my opinion and put words in my mouth than actually listen when I respond to you, then to ahead. It's sort of pointless though.
but in general, you should agree that some problems are better addressed at a supra-national level, right? And likewise, some other are better addressed at a sub-national level. Now, we can disagree on which prerogatives should go to which level (I think defense should be handled at the EU level for example, and I think you'd disagree), but do you agree with the general principle?
"Some problems" in an awfully nebulous concept to agree with. I would agree that we need a better ability to pursue criminals (from small time cheaters to organised crime) over borders. I do not agree that "defence" would be properly handled on a super-national level in our current climate. I do not feel confident that the big countries would put equal weight on the defense of the rest of us as they would on their own interest. And if, say, the situation on the West African coast started standing yo to the French fishing armadas that are currently emptying their waters of fish, then I don't want Swedish resources to defend their greed. Similarly, the inept handling of the current immigrant crisis gives me no hope that a German-dominated "european" defense wouldn't just ignore huge problems until the problems suddenly reach Germany's borders.
But mostly, the "general principle" of "some problems" bring handled on an international level is pointless to the discussion because the EU does not exist to handle only such problems. It is only relevant in your framing of the discussion as "this dude hates the EU", which only stems from you only listening to what you think I say rather than what I say.