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This year I plan to indulge, like I do on all holidays.
However I do get what you're saying - sil got very offended at my lack of cake and carb consumption last year, so I asked her straight out why it annoyed her - why it mattered so much to her, must admit I felt rather ratty when I asked but how bloody dare someone comment on what I eat, I wasn't commenting on her diet - of course she was being completely unreasonable, she was embarrassed and struggled to justify her little jibes and now she has shut up about it.
I am allowing myself christmas day/boxing day to indulge in high carb foods, then straight back into low carbing again. New year is easy with this way of eating, I have loads of low carb party nibbles and vodka & diet coke has no carbs.