I'm a vegetarian. So I just dread the whole affair because while i am perfectly capable of eating various side dishes and dessert, one of three things will invariably happen: I'm the person no one wants to invite because they think I'll be demanding, people apologize all through dinner assuming I'm offended (which I'm not), or people use the main dish as a conversation piece to pry into and judge my life choices.
Most of my dreaded dishes are more people ruining good things I could eat by making them no longer veg, like putting marshmallows in the awesome sweet potato casserole, bacon in the green beans, or broth in the mashed potatoes. I did once have a lovely person invite me over for thanksgiving and make me a single size baked ziti complete with garlic bread since she did basically all of the above. I'm also Jewish, so I've had my share of Chinese meals for Christmas dinner over my lifetime.