British humo(u)r is apprciated by plenty of Americans. What is not appreciated is what some British consider the ironic twist of picking on things that they like. Since we don't know a particular person from Adam and have no idea if they like or dislike banjos, how in the hell are we supposed to know what they're really saying?
Some humor is best left off discussion boards.
I suppose that we could just not take seriously anything the British say. For many Americans, British culture is rather silly anyway.