Aussie Alison Mau says transtasman banter is now more serious than "fun between mates" and there is more bad feeling from Kiwis than they are willing to admit, especially during the Rugby World Cup.
And NZ's falling behind Australia on economic and sporting matters has fuelled the bitterness, she says.
The Fair Go presenter, who considers herself an adopted Kiwi, said the barbs were sharpening and Australians copped more now than when she moved here in the early 1990s.
"For the first time I feel there might be a bit more to it than just good fun between mates. It worries me," she said. "The worst sledges are generally fuelled by alcohol and are both unprintable and not worth the ink."
Mau's comments come after reports of Wallaby fans being spat at and abused while at World Cup matches. But in a long-standing tradition of tit-for-tat, the Herald has received emails from some fans who said Australians were telling visiting rugby fans their country could have done a better job and should have hosted the cup a second time.