Australians love to win things, but we’re going to have to content ourselves with a silver medal in a sport that has yet to trouble the Olympics—we’ve come second to Italians in being grumpy customers. Apparently, we’re divided against ourselves on this issue. What makes some Australian customers grumpy is that other Australians are bad at giving service.  According to this morning’s news report, Brett Whitford, the executive director of The Customer Service Institute of Australia—who must know a bit…