once again the "onlys" getting a bad rap

we were having a discussion around the proverbial water cooler at work about the sloppiest person in the break room, XX was branded the winner of that contest and B piped up with well XX is an only child & her Mom always cleaned up after her so she doesn't even consider cleaning up. That might very well be the case in her situation however I disagree with the assessment that is is because she is an only child, as did Q who is an only child. I am raising an only but I make C clean up after himself I'm his mother not his maid service. Seems like just another unfair characterization of the only child