SIL and her partner always bring their own food when we all meet for family dinners. They don't have any particular dietary constraints but SIL has the food palate of a 3 year old and her partner is constantly on a "diet" (though I never notice her losing any weight!). I thought when you're a guest, you're supposed to be "polite" and work with the host's menu, maybe just declining what you can't/won't eat.
Re: NPR: Is this weird?
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I could give it a "pass" if they did it every once in a while when they knew the menu included something they could not eat. Example--my cousin and his wife would bring tofu dogs to a family BBQ since they're vegan and the rest of us were not. That, to me, is no big deal.
But if she does it every time and they don't even know what's being served? Yeah, that's just rude.