The 18-year-old left the singing competition on Saturday after receiving the fewest public votes in a shock double elimination.
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Now Jack has blasted the former Spice Girl Mel for not allowing him to have more input into his performances.
He added: “I want everyone to know what people saw on X Factor was not anything what you would see at a gig. I enjoyed the show, it were amazing. But don’t expect Eye of the Tiger at a gig. It’s not going to happen."
Jack also appeared to get a bit shady with his former mentor too, revealing he didn't even know who she was.
This weekend's 'X Factor' also saw Lola Saunders voted off on Sunday night, after ending up in the bottom two with 8-piece boyband, Stereo Kicks.
Lola, who has struggled with her nerves in the competition, performed Aretha Franklin’s ‘You Make Me Feel (Like A Natural Woman)’ for the sing-off, while Stereo Kicks sang ‘Perfect’, originally by Pink.