Stiff upper Lip

I don't think that anyone watching the men's finals at Wimbledon between Marin Cilic and Roger Federer expected there to
We've got stiff upper lips and crap teeth. We wear tweed in the rain and are obsessed with our nannies. We hate the French
What on earth has happened to the national reserve and emotional continence for which we Brits were once internationally famed? Where is the 'stiff upper lip' attributed to 'good Queen Bess' and the Duke of Wellington by George and Ira Gershwin in 1937?
I have no personal animus against Andy Murray, and I dare say it is irritating not to win a tennis match, but precisely when did we turn into a nation of snivelling losers? At what point in the history of the last hundred years did the stiff upper lip start to quiver; Did it stop being shameful for a grown man to burst into tears just because he came second in a game? Did it become possible for a serial runner-up to become 'champion of our hearts' not with a bang, but a whimper?