I mean we all have someone we don't like achieving the things we want and we don't feel happy for them. E.g. I just brought a house with the help of my grandparents' inheritance and I told my friends and some of them didn't look too happy about it cos they all want houses too?
But if I go and tell people I'm not happy that colleague x got promoted they tell me not to be so nasty, when other people have done it to me?