> EU hate each other
What gave you the impression that EU members hate each other? It'd be a weird union if that was the case. Not saying it's not possible, I just haven't seen it myself, although I am a Swede so clearly I do hate the Danes and the Norrbaggar with passion, but it's love-hate, not hate-hate.
We love-hate you and the Norwegian Fjellaber as well, you Swedish drunkard.
A Dane.
Likely OP refers to individual countries and quarreling leaders often favoring national interests to what would be best for the union.