The man left the room after being yelled at, Ms Ives said, even though he hadn't finished changing his son.
"His son was hysterical and he's just saying, 'It's okay mate. We'll go back in there soon,'" she said.
"I was absolutely shocked that the poor bloke felt he had no choice but to leave like she said. It's a parents' room, not a f*****g mothers' room."
Ms Ives' tale isn't the first of a man being abused for being in the parents' room.
In February, Queenland man Damien Leeson said he was called "disgusting" while changing his daughter in one of the rooms.
"She looked at me and said, 'That's disgusting to see a full-grown man in a parents' room with a little girl,' and said that I'm a 'dirty old b*****d'," he told local media at the time.
Ms Ives said there was still a societal taboo when men tried to change their children.
"I definitely think a lot of men are stereotyped as 'paedos' far too often. Not all men are perverted; women can be too," she said.
"And in this case it was just an innocent father changing his child's nappy."