It's a belief that the crowd you mix with and 'everyone I know thinks the same as me'. When a broadcaster tries to represent a whole population and its views it's bound to upset some people. This morning I heard a well known media exec speaking on BBC radio make the statement that the BBC had misread the public mood over Brexit and the election of the Conservatives. It should have been challenged. Just under half of those voting in the Brexit referendum voted Remain and most British governments get in on a minority of the vote. In a democracy debate never stops and a public service broadcaster never stops reporting it. In North Korea it's different of course.
As a comedian suggested in a very amusing sketch recently on S4C (the Welsh channel) what some people want is not a television service showing them the world but a mirror.
By the way, I have plenty of criticisms of the BBC and other broadcasters but that for another posting.