Why are the English ashamed of being English?

Post Brexit, the 'remainians' sulk and sneer by way of the nations newpapers and that great British aunty, the BBC. 

George Orwell, the great 20th-century socialist writer described brilliantly the type of Left-wing intellectual who instinctively hates the very idea of Britain, in his classic essay The Lion And The Unicorn.

‘England is perhaps the only great country whose intellectuals are ashamed of their own nationality,’ wrote Orwell. ‘In Left-wing circles it is always felt that there is something slightly disgraceful in being an Englishman, and that it is a duty to snigger at every English institution, from horse racing to suet puddings.

‘It is . . . unquestionably true that almost any English intellectual would feel more ashamed of standing to attention during God Save The King than of stealing from a poor box.’ This brings to mind Jeremy Corbyn,  Leader of the

UK Labour Party refusing to sing the national anthem at a Battle of Britain memorial last year or refusing to crook his aged knee to the Queen.