People don't help others these days, they only do favours

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First of all let me clear the difference between help and favours, as told by my friend. She said helping someone means 'not expecting anything in return & being self-less' while favours means 'expecting something back for something you had done & being selfish'. She said if I was doing her a favour "I don't want favours from someone". My question is nobody helps anyone,everyone does only favours (my belief). So, to the opposite party how does it matter? As it is he/she wants their job to be done, for that moment it doesn't matter if it was a help/favour. Isn't it? And, one more thing, I would definitely like her to help me back when I need something,so I am not helping, it is a favour. Can someone explain this question or rather confusion, do you believe my belief is right? If you know the other person is not helping you when he can, you won't bother to help him or even do a favour, isn't it? And, If it is stranger I would help him if possible and I can't expect this stranger to help me back, right?