One thing I think that gets old for the British is the common claim by uneducated Americans that the British would not have won the Battle of Britain without US support via Lend Lease. Lend Lease did not happen until 1941, well after the Battle of Britain. The US was not gung ho to support a nation that we thought was likely to be overrun by the Germans. It is more complex than that obviously, but I don't feel like typing a paper.
Most people here don't make those kinds of claims, but man oh man are youtube video comments full of them.