Remember how when we were young we were very impatient. We demanded the littlest of things NOW. We fought over silly stuff. I remember I fought with my siblings over pens!!! And if any of them ever set foot in my room, even harmlessly--hungama in the house!
When we become older, we essentially become a child again- just not that cute. So forgive and forget! You will be the same when you are a buddha, and I'm sure you would want that person to do the same for you.