For a long time, Britons who wanted their country to leave the European Union were regarded almost as mentally ill by those who wanted it to stay. The leavers didn’t have an opinion; they had a pathology. Since one doesn’t argue with pathology, it wasn’t necessary for the remainers to answer the leavers with more than sneers and derision.
Even after the vote, the attitude persists. Those who voted to leave are described as, ipso facto, small-minded, xenophobic, and fearful of the future. Those who voted to stay are described as, ipso facto, open-minded, cosmopolitan, and forward-looking. The BBC itself suggested as much on its website. In short, the desire to leave was a return to the insularity that resulted in the famous—though apocryphal—newspaper headline: fog in the channel: continent cut off.