At the time, the judge said the singer had become over-confident, while Tulisa Contostavlos branded her "quite mean".
"We're just being honest. We sometimes say things we shouldn't say, but we're emotionally involved in our acts and we want to win," Walsh said.
Contostavlos continued: "Whenever I'm on the show, I'm saying what I'm thinking. I don't premeditate situations and think, 'I'll be like this or do something like that'.
"I'm just 100% me. What comes to me at the time comes to me. If people like me, great, if they don't, so be it. It's always going to be about the music.
"You need to see every side of a person and see them in every situation. When you do that, there will be tears, drama and laughs, but it's still about the music and it doesn't make it any less credible a show."
Walsh added that the upcoming ninth series of The X Factor will be "amazing".
Photo gallery - X Factor launch 2012:
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