In here eloquent riposte to the "snobs" who excluded her (published in the Times, no less), Katie railed against the unfairness of letting others in, whereas she, who has actually played polo was rejected. Quite apart from the issue of whether the bacchanalian tableaux that is the Chinawhite tent is a suitable day out "for the family", the idea that such an event should seek to exclude anyone on grounds of taste, class or anything else is absurd.
Furthermore, given that Polo as a sport has made at least some progress in widening its appeal, that it should be associated with such daft discrimination is potentially damaging. The Cartier International Day provides the lion's share of funding for the HPA's development budget - and I am sure that China White's contribution to this is substantial. Since it was apparently China White's people who rejected Katie's money, a good start towards showing that polo is not completely up its own backside would be to find another nightclub operator to provide the entertainment at next year's International.