Again, we’re seeing instant karma. Even though breaking your wrist isn’t fun, it seems like he deserved it. He made fun of a girl and then proceeded to break his wrist immediately after. We’re not sure how many years have passed since that incident, but it’s clear that he still remembers it.
He certainly learned his lesson, because it seems like it still haunts him to this day. At least it seems like he never did anything like that ever again. It’s one way to learn something, even though it’s not the easiest way (via Constative).