[Airheaded? Scatterbrained? He certainly does give off that impression the majority of the time. And while it's not the wrong conclusion to draw, he is in fact capable of being serious when the situation calls for it!]

Ahaha, is it that obvious? It is something of a necessary skill in upper-class society... so many rules and manners that one needs to learn, after all. The worst part is trying to keep them all straight!

[But it is something that he excels at by this point, so hearing it affirmed doesn't come as a surprise to him.]