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.

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.

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