Final answer:
More context is required to specify what constitutes Ted's biggest Christmas disappointment as this could refer to an unspecified text or storyline.
Step-by-step explanation:
To accurately address the question regarding Ted's biggest Christmas disappointment, more context is needed as this question may refer to a specific book, story, or event. Without additional information such as the author, the context within which this character exists, or the storyline, it's not possible to provide a factually accurate response. Ted could be a character in a novel, short story, or a subject of a creative writing prompt. In each of these cases, his disappointing experience at Christmas would be sourced directly from the related text or assignment. To assist you better, please provide more details or clarify the reference to Ted's Christmas disappointment.