Also, girlfriday, learning to let these things go is better for your own mental health.
Again referring to my mum - she has unrealistically high expectations of other people's behaviour and so is constantly disappointed and upset. I tell her that the people in question won't change but she can cause herself less stress by lowering her expectations. That doesn't mean making yourself a doormat, but accepting that sometimes you won't get the reaction or response you want or think you deserve. Let it go, for your own sake.