you had to assume they weren't very bright to begin with , if they belong to a church they likely believe theres a man living in the clouds that can grant miracles , yet watches kids die needlesly every day , so it wouldnt be a stretch to assume god should already know exactly what they like to eat and thus it would be ok to bitch about free food.
By helping out , you being an extension of god, you should have known they like their green beans cut french style and it was blasphemous for you to suggest they eat regular style beans of any sort, infact how dare you flaunt your wealth by trying to force this family to eat bland green beans..