I'm going to refuse to do favours all the time
Why are you refusing favors?
I am too lazy to do favors at the moment.
You should help people, even if you are lazy. People will appreciate your efforts and can help you out later.
I have the right not to help those who don't help me
It is true that is your right, but if you get help from others and don't help them in return, they may not help you in the future. That is why it is good to help others out.