an axe and the tree

There's this guy whom I encountered after a class and he said outrightly to me: "your parents must be so ashamed to have a son like you." Perhaps he's been watching my behaviour and things. 
I didn't have anything witty to get back at him then, nor do I have now. Maybe I was so used to insults that I just shrugged them off, or maybe there's some truth in it that it paralyzed me in a way. 
I suddenly remembered that encounter tonight I'm just curious what's he doing now and does he remember what he said to me years ago? 
But how foolish I am to think that way. An axe will not remember anything, the tree does.