First of all, being light on something is a condition to which I aspire. (See "Throw Down, Cooker's")
But perhaps we Americans live in a post-ironic age that began 09-11-01. oops, that betrays a sense of American exceptionalism, right?
Maybe we're just dense people who don't fathom the terribly sophisticated and obviously superior wit of the Englishman.
Then again maybe irony is being wrongly equated with wit. According to Socrates, irony came from saying the opposite of what is true in order to underscore the truth. I suppose you would have to have a sense of the ironic to appreciate the New Yorker's cover treatment of Obama and his wife. To many people, it just seemed like a failed piece of satire, in terrible taste.
Not sure what truth is being revealed in your "sportsman" post, but then I am a dense American. It didn't seem particularly funny to me, but then I am not blessed with that wonderful English sense of humor. (I mean you warned "patriots" -- i.e., rubes -- not to take exception. Wondering: Would it still be "ironic" if you were naming an English "sportsman" for all time? Or is it only ironic to mock Americans and American manners, mores, and culture? Do you only run irony tests on others because your own sense is finely honed?
Of course, if you have to explain it to an American, that just proves your point, doesn't it? Perhaps we are all awash in irony and don't realize it. Maybe this whole post is just brimming with irony, who knows? The uses of irony are many and mysterious -- often known only to the irony dispensers.