I'm a fussy eater, but I'd never use it as an excuse to be rude. I ask about certain ingredients, and if it's something I don't eat, I just say "thank you" and eat whatever else. And if the hostess wants to "make me something special" (that I'd eat, aside from what she already made) I always refuse and tell her that there's so many good things already, I can find plenty to enjoy!
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