It all started when Preston gave an interview to Kyle & Jackie O badmouthing White's controversial son after he allegedly had sex with another contestant on Celebrity Big Brother in the UK while he was engaged and boasting about spending $500,000 of his father's money on drugs and sex workers.
"I think it is that terrible thing when you have kids that go off the rails, how do you deal with it?" Preston said to the radio hosts during the chat.
"I mean any dad would feel that whenever your kid goes off the rails the first thing is: 'What could I have done better?' I think Marco is no different."
The Masterchef judge added: "I think there is absolutely nothing wrong with your children having a highly evolved social life but I think the drugs might be a little bit of a worry!"
The tension soared from there, with both Pierre White and his son going on expletive-laden rants, with the Hell's Kitchen judge saying he "will never forgive" Preston.
Last night, Melissa Doyle asked if there was still bad blood between the two by asking, "Did he cross the line by talking about your children?"
"You know the answer to that," he shot back.
"I don't have to get involved. Don't ask me a question I'm not going to answer and don't try and draw me into something I won't be drawn into."
He was more than happy to talk about his feud with Gordon Ramsay though.
"We never fell out, really," White told Doyle.
"He just happened to turn up to my wedding with a film crew that were hidden in the bushes, filming my children and my friends and my family. And then that appeared in his next food show.
"Would I ever turn up to somebody's wedding with a camera crew hidden in the bushes? Would you? Because I'm very simple. If I can't enrich you're life and you can't enrich my life, why should we know each other?"