In mid conversation, why do people say " are you an only child"?

It's weird to me when that comes up mid sentence.
What are they trying to imply?

That I'm not "cool" enough or something

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Lyfis2live

Generally, only kids lack the sharing traits and hence, get to hear such, often.

SW-User

@Lyfis2live Maybe some do. I was an only who shared everything with my friends and parents as a kid, inclluding info... Maybe shared too much, in fact. I tended to get taken advantage of. Kids with siblings learn to defend their territory.

iamnikki · 31-35, F

@Lyfis2live the comment wasn't about sharing anything

Lyfis2live

@iamnikki Yet it is the essential that, once observed missing by those people, make them say what your post mentions.