The site said they were commemorative medals which should not be worn with service medals.
"The conservative view of most veterans is that only 'posers' wear these medals and they do not add to the regard of any wearer," the site said.
Treanor said he served as a radio operator with two Australian battalions in Vietnam and was entitled to wear service medals.
"I'm certainly not an impostor. I'm certainly not a wannabe."
He said the Internal Affairs Department awarded him the volunteer medal for his voluntary Civil Defence work over 13 years.
The 150th anniversary medal was available for army personnel to buy, which he did, Treanor said.
He said he was a Regular Force cadet in 1964 and was awarded the medal for that.
"I'm not wearing anything I'm not entitled to."
RSA national president Major General Don McIver said he understood why the site was set up and its motives were "appropriate".
He said it was unfortunate the website didn't take postings down when people admitted they had exaggerated their service history.
One of the investigators who works on the site, Australian-based Bill Hobson, said people wearing medals they hadn't earned or those making false claims about service needed to "do their time".
The website has named 249 New Zealand and Australian "wannabes".
Hobson said he was not sure how many of those were New Zealanders "but there are quite a few".
He said the site's investigations were thorough and no legal action had ever been taken against it.
"An informant gives us the information and then we go about accessing true military histories," he said.
Only about 40 per cent of the people checked out ended up on the website, Hobson said.
