"We are all basically selfish" is a truth, it's been believed by our human. But many people don't like being describled as selfishness by others.
There are two conditions:
One is that I am really selfish, I have never thought about anythings for others only for myself. And I am angry when I heard I was selfish and blamed by someone living around me. Because I think it is my right to care or not, why I need do it for you?
This kind of man will not be respected and accept by other people.
The other one is I think and do many things for you. But it's regarded as harmness, even to be said selfishness. In this condition, I will be unhappy or sad. The opinion to help others will be moved or disappeared.
So we should understand each other and take care more of others.
If we are all think so, we are not regarded as selfish man.