It emerged on Thursday night that the AFL's controversial ticketing system was being investigated by the Australian Competition and Consumer Commission (ACCC) after an official complaint from fans.
On Friday morning Demetriou lashed out at the support group's president, Brian Clarke, saying the former AFL Queensland employee had an agenda against the League.
Speaking on 3AW radio, he labeled Clarke a disaffected employee who had "caused havoc everywhere he has gone."
"I think this is a bit of a stunt by Clarke and co," Demetriou said.
"I don’t know what the complaint is, other than we'll cooperate with the ACCC, as we’ve always done in the past.
"Anything he (Clarke) can do to get into the paper, he will … he’s been trying to get back into the system for years.”
Demetriou said there was a legitimate role for a fans' association in the AFL, but the group needed to "take a good look at their leadership".
"We cooperate with our supporters, we listen … (but) trotting off to the ACCC about prices, good luck with that one," he said.
"That's an issue we are addressing, but we're not quite sure if it's an ACCC issue.
"I'm very comfortable with the AFL's view on pricing. We're a very affordable sport.
"I'm comfortable that we're addressing the issue of variable pricing, because it is an issue – it's confusing and complex."
Demetriou also took aim at the Melbourne Cricket Club, labeling it "slow on the uptake".
"They might discover wi-fi soon – a bit of connectivity would be good in the 21st century," he said.
"They can lift their game too, like all of us."
MCC spokesman Shane Brown said he understood customer expectations on connectivity were not being met consistently, but significant effort was being spent identifying a solution.
He said the MCC was working with telecommunications networks to improve phone and data coverage at the MCG.
"We have witnessed new technologies in action and we want to ensure the MCG remains one of the greatest stadiums in the world," Brown said.
"However, there are many factors to consider when looking at an appropriate long-term connectivity solution, particularly for a venue of our size. It is a significant investment and we want to get it right."
Twitter: @AFL_Nathan
