Nobody disputes the massive contribution made by the US in WW2 and yes we are grateful for your efforts. The effects of American industrial might and manpower were a telling factor, but in Europe, for example, much of the heavy lifting was done by the Russians,who suffered almost 20 million casualties.
Ironically ,the Russians were only kept in the war by the efforts of the British and US merchant fleets and the Royal Navy with Arctic convoys.
The war in the Pacific was where the US did the majority of the painful work. You mention Singapore, the most ignominious defeat in British military history, we had no quarrel with Japan in the 1930s but our complacent politicians failed to see the potential fall out from the US/Japanese power struggle that was taking place in the region and we were unprepared with focus being on Hitler and events in Europe Hindsight is wonderful.