I hate pumpkin anything. Pumpkin pie, pumpkin coffee, pumpkin chai...all of it. If you tell me something has pumpkin in the name, I'm going to tell you "no thanks".
I also don't like sweet potatoes, so I decline those dishes as well during the holidays.
Green bean casserole is disgusting, I think, and I would happily ban it from any holiday dinner I attend. Two years I got stuck making it for a family dinner, and I had to have DH help me with it because the smell was too much for me and I felt like I was going to vomit. The family figured it out, and last year I got to make mashed potatoes instead (which everyone raved over!).