There seems to be almost a competition where I work to utter the most disdainful put downs of the Office Party - "Ugh no, I wouldn't be caught dead..." "God, I have a life....." "I've enough problem seeing my 'real' friends at Christmas without wasting a night" and so on.
I can take or leave the Office Party, and have frequently not gone because I've something else on, the venue doesn't suit me or whatever. But I just make a polite excuse.
AIBU to think some people are almost rude in their eagerness to show they've 'far better things going on in their lives' than the office party'.