very sporting

An Englishman and an American are lying side-by-side on deck chairs abroad a cruise liner. Soon enough they strike up a conversation, which begins with the American ticking off the Englishman saying, “You English are all so tight arsed. You have got to learn how to loosen up a bit. You all set yourselves apart too much. Look at me for example; I have Italian blood, a little Indian blood, and even some Swedish blood. What do you say to that?” The Englishman says, “THAT’S VERY SPORTING OF YOUR MOTHER.”