Perhaps hate isn’t the right word. Germany, France, Spain, Italy - the original contenders - have always viewed the UK as being arrogant in wanting special treatment. The UK has received special treatment, largely because it suited these countries to appease the UK in the context of the original purpose of the European project.
Brexit is technically a legal event. But just as the ECJ, the EC, the EEA etc and their functions and rights/responsibilities are legally enshrined, they only exist because of the political will of the people. Again, there’s no divine law, no immutable European constitution (much as the federalists would like one, I think). The law is what the people vote it to be (very high level, of course). Exiting the EU is a novel thing. Brexit will set a precedent that will last for decades, and be relevant perhaps not just to the EU.
De Gaulle had the English (don’t know of his grasp of the Scots, the Welsh or the Irish contingent in the 50s) down right, evidently.
It’s funny how the population was largely sceptical of the EC (as then was) at the time of full accession, how fervently the riposte was about loss of sovereignty and independence. There was all manner of references to Churchill and the war, still echoed by the majority of the Leave contingent. Fast forward 25-odd years and reading anything but the right/far right press, you’d never believe it.