I am somewhat amused by the reaction to the Australians sledging of the Black Caps during the Cricket World Cup final. It is clear that, with a couple of exceptions, the Ozzie cricket team display incredibly poor sportsmanship, even to the point of racism on occasion. But what else is new? Why are so many incensed by their oafish behaviour?
Sledging, or trash talking as it is known in the US, is a sad but integral part of many sports. The more contact there is in sport the more trash talking there often is. Some athletic cultures thrive on trash talk–think boxing, American football or league.
On the other hand more ‘genteel” sports like golf, tennis or cricket are expected to provide a more civilised approach to the game. When athletes in these sports adopt more vulgar competitive approaches such as trash talking, they are quickly denounced. John McEnroe and Jimmy Conners in tennis, John Daly in golf, and an assortment of foul-mouthed cricketers have felt the wrath of those who feel that these sports are above the everyday fray.
That, I think, is the heart of the matter. It is a class thing. It is acceptable and considered normal to trash talk in “common” sports played by working and lower class people. But when it comes to the sports of the upper classes and elites, of which cricket, polo and yachting are the epitome, it is unacceptable for players to descend to the level of the hoi polloi. At most, in between tea breaks and pressing their linens for the evening overs, cricketers were and are expected to offer no more to their opponents than witty banter. It does not matter if these sports are now played by non-elites (some of the Australian cricketers can barely string a sentence together, much less hold a degree). What matters is that the genteel image of the sport must not be tarnished by crass displays, verbal or otherwise (recall that Wimbledon still has an all white dress code for players and prohibits shorts on female players).
In effect, the definition of good  and bad sportsmanship is determined not by the nature of the game but by the classes from which it originated. What is acceptable gamesmanship in sports that originated in the working masses is not acceptable in those that had their beginnings in more privileged circumstances.
The outrage directed against the Australian crackers for their sledging is more about about maintaining the appearance of class appropriate propriety than about their very poor sportsmanship. Had their trash talking happened on a soccer or rugby pitch it would have been considered perfectly acceptable and perhaps even gentle ribbing.