I can see how it would certainly look that way, but as all British people know from birth, we've never lost a war.
The 'skirmish for the rural provinces' as we call it here in the UK, was a disappointing side-affair we left to Cornwallis, the man couldn't run a bath let alone a war with some farmers. 'Cornwallis' we said, 'there's no need to worry, the greatest of their generals is a master of the tactical retreat with a specialism in river crossing'
Then, when we were poised to win, we had some trouble in Ireland, India and various other places.... so we just decided to leave, of our own free will, there was no humiliating defeat in which our king was killed - we just signed a bit of paper and fucked off home for tea and crumpets.
I suppose, if you wanted to call it a humiliating defeat at every level then you could.... but it does very much mirror the Vietnam war in that respect, and that's still counted as a draw. And much like Vietnam, we won the long game politically. You still speak English (badly), you enjoy James Bond, Harry Potter, having us as villains in Hollywood, you like the Queen and we even gave you Prince Harry because we were done with his silly ginger bullshit. :o)