Married at First Sight Australia's relationship experts say groom Jack Dunkley's "Muzzle your wife" comment at the dinner party was "one of the worst things" they have ever heard on the show.
During the latest commitment ceremony, John Aiken hauled Dunkley over the coals for his telling fellow participant Jono McCullough to "muzzle" partner Lauren Dunn.
"I heard something last night that was appalling," Aiken told the group during the show, before turning on both McCullough and Dunkley over what had happened.
Aiken hit the roof after McCullough had apologised to Dunkley and wife Tori Adams rather than defending his wife.
"Jono, who's more important to you: Lauren or Jack?" he exploded.
"If someone said that to me about my wife, I would not back down. I would come out full throttle, all guns blazing.
"She spoke up, she was called a dog. But you weren't upset by it!" he said before demanding to know why the rest of the group did not step in.
"I was disgusted by it: put a muzzle on that woman. I've heard some things in this experiment that have repulsed me. That was one of the worst things I've heard.
"It's simply not good enough. If you're in that position again I want you to speak up.
"It's your responsibility to call out bad behaviour."
Dunkley went on to reveal he was "ashamed" and had "lost sleep" over the comment.
But fellow expert Mel Schilling demanded to know why Adams had not expressed any disgust over what had been said.
"I'm not dismissing or discounting the comment. It was disgusting. But it doesn't come natural for Jack to talk like that," she argued.
However, Schilling disagreed saying: "It seemed very natural. It seemed like a reflex."
Fans have previously voiced concerns about Dunkley's behaviour, with many initially expressing distrust over the self-professed "alpha male" and his threat to "sort out" his new wife and make her a "good girl".
The couple tied the knot in episode two of the new season, but there were concerns the relationship would turn toxic after Dunkley's comments to producers about the pairing.
While Adams professed her new husband was everything she wanted in a match, Dunkley was a little less enthusiastic, saying he wanted "to play that dominant role to Tori".
"She seems sweet. I think she'll challenge me a little bit, but I definitely reckon I'll sort her out, and we'll have a good time," he said.
"I definitely want to play that dominant role to Tori; it might be a bit of a power struggle. But I feel like she's gonna be a good girl."
"Jack is a massive instant red flag, he will end up being super controlling, gaslight and probably the first one to cheat," one viewer said online when the wedding happened.
Another commented: "They're not orange flags - they are the brightest of bright red."
Adams' best friend Lea also expressed concerns about Dunkley at the wedding, noting that all of his invited guests were people he had met at the gym and he had no actual friends or family at the event.
"The majority of his guests here are clients. You are a reflection of your friends and the company you keep," she said.
"Where were his high school friends? Where was his best friend? Is this a reflection of his inability to have long-term relationships? And that's what clicked for me where I thought 'okay, what's going on, who has my friend married'?"
Full episodes of the current season of MAFS AU are streaming on ThreeNow and airing on Three at 7pm Sunday-Wednesday.
