Too say that Americans don't understand Irony is wrong.

New york is soaked in it, and new york music and comedy is intoxicated with it.

however It seems to be the case that there simply isn't room for it in LA and even friends I have from the UK and Australia seem to lose their sense of Irony after they have been there a while.

But the USA is too big and varied to compare it to the UK.

And besides, neither of them are French ...