In describing the situation, ironically and without awareness, this anon describes the worst behavior you can imagine to treat your sister. She is excluded from family weekend shopping excursions and made to feel different. They’ve decided to single her out due to her lower income, and because she isn’t as consistent about going to church as they are.
Even worse, she described her sister’s completely valid complaints as if they were part of this ‘problem’. The undercurrent of insensitivity and lack of empathy is, in a word, unmistakable.