'but you listened to those of the other side'
No, we didn't listen to what Boris Johnson said in order to make up our minds. We already knew, as Dominic Sandbrook in the Daily Mail says "it was brewing for years", it was a long time coming.
As Will Self decried , the working classes of the North East and all of England and Wales couldn't be reached by the pollsters, they couldn't be reached by the political elites because they don't understand the people. The BBC couldn't pull their usual tricks on the people for the sake of the metropolitan elite.
There was record turnout, and Cameron and the Etonian team breathed a sigh of relief as their Lords Such and Such who poll for them told them, "it''ll be alright on the night". But it wasn't alright, the people gave them an awful fright. The high turnout was the working classes, so long ignored, so long mocked, so long despised by the metropolitan elite in Westminster and at the BBC and they were voting out.
'This is the first of many disappointments. '
This is the first victory of the people over the elites. It may be followed by disappointments, but we are used to those in the Houses of Praliament. Rome wasn't built in a day, but we are on the way to governing ourselves once again and having an independent country.