Some People Are Just Beyond Our Help
This person was simply trying to help a family member in need by giving them old textbooks, but the parents seem to be the real issue. This text exchange perfectly highlights why this person chose to move far away from their family in the first place.
Of course, it is completely reasonable to ask them to pay for the books’ shipping fees. The postage price is most likely lower than what they originally would have paid for the books. However, stooping as low as calling the generous giver a despicable human being just because they cannot go out of their way to help with shipping? I think it is clear who the shameful person really is here.