Do atheists believe in the existence of friendship?

[KerimF]

Let us simplify things and forget all what people may say about friendship.
 
If we, just you and I, will try to be real friends, what is the most important thing, if accepted by both of us, lets our friendship be a real union, practically speaking? It will be so, not just between us, but in front of the entire world.
 
I guess there is no hint clearer than this

(Bold mine)

Again, I reject the premise. I can’t imagine a set of circumstances that would make me try to be your friend.

Boru

Sorry, soon after I wrote you, I somehow predicted your reaction.
I admit that I had to say it differently.

Now, let us forget about me. And imagine any human on earth instead of me. What could be that thing?