It’s become clear some hobbies are essentially status-seeking among young adults and/or showing off to potential partners. They simply don’t make much sense anymore for someone married with kids.
Motorsports and pushing grades rock climbing, for many people I knew. I am also suspicious of ballet and trivia.
You know you’ve found one when, in a gathering, none of the participants seem to particularly like each other and mostly seem interested in one upping the others.
A more obvious example is drinking a ton of alcohol at parties.