The title of this piece led me to think about the joys and challenges our characters face. How do they handle these? Which do they cope with better? (Not everyone handles happiness that well - they literally don't know how to cope with it or live in such dread that the happiness is going to end any moment, any enjoyment of it is lost!).
Are others pleased for your characters in their joyful times or is there resentment there (openly or hidden)? In the challenges your characters face, do they have friends and family to support and encourage? When your characters overcome a challenge, do they go on to learn from the experience or does their success change them (and not necessarily for the better)?
This is where the core central values and attitudes your characters have really matter. Someone who is generally a decent character is not going to upset others by showing off about their successes. They will have friends who are genuinely pleased for them. Someone who aggravates others will only find said other characters will be rooting for their downfall!