I know exactly how you feel but from the most opposite food choices. I'm vegan and I never hear the end of it when I bring food. But it only becomes an issue if people know it's vegan/gf/whatever makes it 'different'. I just stopped mentioning it and people all the sudden thought everything was great. Everyone has preconceived notions about things, even food. I might mention something about it now after they've eaten it and passed their opinion based on flavor.

In your case I wouldn't make anything for them ever again, they obviously can't appreciate trying delicious new things.