This is also the experience of one of my good friends. She has an intestinal disease and many food allergies.  If she tries to prepare her own food, they make sure to point out how much this somehow inconveniences them.

It seems like both your families take some kind of pleasure in trying to deny you a basic thing. She has said it seems like her family wants her to sit at the table with an empty plate, just watching them eat while they criticize her, and I am getting that vibe from your post as well. 

Good on you for making the reservation! Enjoy your delicious badgers!