Ben Brown became the first player of 2019 to kick 10 goals in a game, with the Power falling outside the eight following the big loss.
With a finals spot on the line, Cornes was disappointed with the Power’s attack on the football, suggesting the club looked like they didn’t want to be at Marvel Stadium.
“It was an absolutely pathetic performance from a side that could have pretty much sewn up eighth spot tonight,” he told AFL.com.au.
“They didn’t want to be there, which is a pretty strong thing to say about a football club.
“I think on the whole, up until this point, it’s been a reasonable year for Port Adelaide with the young players they’ve developed, considering the players that left in the off-season.
“Prior to this, I would’ve definitely given them a pass mark.
“Now, they still may make finals… but that was completely unacceptable tonight.
“They need to take a hard look at themselves, it was a player issue that they looked like they didn’t want to be there, they didn’t want to apply any pressure and North Melbourne were far too hungry around the footy.”