My neighbour often comes round asking to borrow food. She always replaces it, but rarely with what I gave her, eg spelt flour instead of wheat, battery eggs instead of free range, and today UHT milk instead of pasteurised. I said thanks but no thanks to her DD for the milk because I can't stand UHT and we won't use it, and am now thinking that I've probably offended her.
Am I being petty?