The 17-year-old has accused both Gary and mentor Louis of not supporting him, raging:
'Gary had a problem with me throughout the whole show. He never seemed to like me and whenever I gave a good performance he would pick up on the smallest things in the world.
‘I was disappointed with Louis saying, “Vote for Sam and her single everyone”. It felt like Sam was getting all the love.’
The Scottish teenager’s mother went further, adding:
‘It was completely unprofessional, Gary refusing to stand [like all the other judges] after Nicholas’s song.
‘As for Louis, I don’t know what that was about and it was rude of him.
'He should have been backing his own act and not encouraging the public to vote for their opponent.
'I think Louis just speaks without thinking sometimes.’
Nicholas received negative feedback from Gary after performing Robbie Williams' Candy in the final sing-off.
The judge, who wrote the song, said: ‘On a night like tonight it is all about showcasing your strengths and I just didn’t think that song showcased your voice.
‘I think Nicky is a balladeer at heart and that was going in another area I have never heard you go before.’
But Nicholas isn't completely heart-broken at losing out to Sam Bailey.
'I am really happy I can just go home and spend Christmas with my friends and family.
‘If you came in first, I knew you would be doing your promo for your album, singing it everywhere and doing a lot of things.'
The young singer will spend the festive season with his mother, his father Derrick, brothers Kevin, 18, and Lewis, 13, and his eight-year-old sister, Antonia.
His proud mother said:
‘We are so proud of what he has achieved and in my eyes, wherever he came in the competition, he was always the winner.’