Apprentice winner Joseph Valente pulls no punches when he talks about "short tempered a******e" Lord Alan Sugar.
Joseph won the show in 2015 but bought out Lord Sugar shortly afterwards, and there is no love lost between the pair.
Explaining his decision to ditch Lord Sugar and his team, Joseph told MirrorOnline: "After winning the show you are promised a team of business mentors and advisors, but it turned out to be Lord Sugar and a team of accountants.
"They weren't the mentors or strategy team I needed to grow a field-based business, they were used to technology and manufacturing.
"After a short time it became apparent they weren't able to lend their expertise other than basic accounting information to my business model.
"The people he brought to the meetings were very much team Lord Sugar, and there was five of them and one of me, so every argument I put across I was always outvoted.
"They are so scared of him so they did not dare challenge a word he said, whereas I challenge everything."
Realising the team could not offer him anything of value, Joseph became "frustrated and demotivated" and was keen to scale up his business, but says Lord Sugar refused to take on that risk.
"Lord Sugar isn't the easiest guy to be around, he's very short-tempered, you only get an hour and he doesn't want to listen to anything you have to say," said Joseph.
"He wants no risk, it's all about his reputation, he just wants guys who keep quiet and too amibitous.
"I told him, 'I have had enough, you aren't giving me the support I need and you aren't giving me the answers, I want to go national and you don't want to take that risk, so let me buy you out.'
"He said no one had ever spoken to him like that before."
He added: "I speak to him on Whatsapp and email all the time but we just argue.
"He is a very opinionated man and he doesn't give a s**t about what people think, he isn't a likeable guy but you have to respect him.
"I can't stand him, but I still have a picture of us in my office, I respect what he has achieved in business, but he is an a******e."
Speaking about his "gruelling" experience on The Apprentice, Joseph says its even tougher than it looks on screen.
During the nine week process, he says candidates work 18 hours a day with no phone, internet, money or choice over their food.
He claimed they drive for hours and are banned from speaking unless the camera is rolling, spending hours in a silent, dark room before they even enter the boardroom waiting room, and once they do they remain there for another silent four hours.
This only adds to the tension and pressure when candidates are finally brought in to see Lord Sugar and meet their reckoning.
"He's a small man but he is a scary intimidating man, it's like being interrogated by an SAS officer," laughed Joseph.
"If he says a joke and you laugh for too long, you get a look and you have to shut up, because boom, he flips on you straight away."
Regarding the future of the show, Joseph believes Lord Sugar will only ever pick a certain type of winner.
"He picks winners now who are very quiet and won't give him any grief after me, he doesn't want them to become their own brands, he doesn't like people who answer back," he said.
MirrorOnline has reached out to reps for Lord Sugar and the BBC for comment.
* The Apprentice airs tonight on BBC1 at 9pm
