LOL at all the answers thus far -
I think it's down to the ability of people to converse - i.e. interact in a meaningful way.
Talking about your kids is fine - if it's a conversation with like-minded people, and there is a bit of verbal give and take, discusssing common ground and so on.
But as these answers demonstatre, some people cannot converse, so they monologue, and that is what is boring. their diatribe doesn;t require any input what ever from the listener, it sometimes doesn't appear even to need the courtesy of attention - the monologuer never takes the time to see if their audience is interested or not, it's not necessary.
So, the subject doesn;t mater, if's the way it is either discussed, or simply aimed at you like a verbal firehose!
So, about my wekend. I started cleaning the bathroom ....(door closes quietly - again!)