TV watchdog Ofcom received more than 300 complaints about this year's show from viewers.
Speaking in last night's Coming Out show, Iain insisted there was never any bullying as far as he was concerned.
He said 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."
However after watching the show back and seeing what he hadn't in camp, Iain suggested he had changed his mind.
Iain tweeted: "Bullying is a strong word. But I was unaware of a lot of what was said behind my back and also what some people said about me after they'd left."
He then added: "And now I feel very nervous about the potential reaction to that previous tweet. All I know is strawberries to 1 side, I did not lie or bad mouth anyone anytime in the camp. I was rude about Stanley once but confessed immediately. I was honest and me."
The radio host finally commented: "I hadn't seen the comments made behind my back or the ones made by some camp mates when they left. I still suggest the word bullying is too strong. But."
The Coming Out show follows each celeb as they leave the jungle.
The issue of 'bullying' in the camp proved to be a big one, with Rebekah Vardy breaking down in tears.
She sobbed: "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 said: "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."
I'm A Celebrity will return to ITV next year.