So in my Fairy Kingdom there are rules about what people can and cannot do. Magic is not allowed to be used directly in the presence of the Queen for one thing unless she is the one performing it. This is to stop any magic rebounding on her, accidentally or otherwise.
Showing off is allowed within the context of magical shows where displays of different spells are allowed under controlled conditions. This has the advantage of allowing people to "let off steam" but reduces the risk of different groups killing each other as showing off gets out of hand.
So in your fictional world, especially if it is a magical one, what showing off takes place? If there is no showing off urge (which I would find hard to believe, there has to be competitiveness somewhere), what has been done to suppress that urge and why? Can that suppression be broken (the consequences would be like a dam breaking I would imagine)?