Scrooge's dislike of Christmas stems from a deep bitterness and resentment towards the holiday, which he associates with loneliness and sorrow. Scrooge believes that Christmas is a meaningless and frivolous holiday that encourages people to indulge in unnecessary spending and self-indulgence. Scrooge's cynical outlook on life is reflected in his dislike for Christmas, which he sees as a reminder of all the things he has lost or failed to achieve.