Why is my friend being horrible to people not on benefits and the country when she is handed everything?

you can only dislike certain behavior's in others if it is something you are/ do yourself ...............its the same with everyone .people that critisise everyone are more then likey un happy .when you are happy you see the good in everything ...............being a single mum is difficult i am one but i pa my morgage and work i have three children .she should get a life instead of being mean