TV watchdog Ofcom received more than 300 complaints about this year's show from viewers.
But speaking in tonight's Coming Out show, Iain insists there was never any bullying as far as he was concerned.
He says on the show: "There was no bullying going on. Let's quash this rumour once and for all.
"Bullying is a very serious thing. It's a huge word. There was no bullying whatsoever."
The Coming Out show follows each celeb as they leave the jungle.
The issue of 'bullying' in the camp proves to be a big one, with Rebekah Vardy breaking down in tears.
She sobs: "You know what, I was the one that was being the most supportive of him… A bully? I've never been a bully in my whole entire life."
Dennis Wise later says: "Obviously Iain was in there to upset everything in the camp and that was his intention. If he's playing a game he's played it extremely well. He's obviously done it for his own reasons and that's up to Iain to explain himself."
Becky and Dennis then meet up.
She tells him: "I came out to the biggest s**t storm. And you know I don't get upset about things and you know I'm really strong but I actually cried in the car. It really upset me.
"Something so strong has been said about not just me. You, Jamie [Lomas], Amir [Khan]. That we were part of a gang."
I'm A Celebrity 2017: Coming Out airs tonight at 9PM on ITV.