The bars of convention.

You're not supposed to have a child alone, not where I'm from. It's just not done. That they would rather I had stayed in a dead marriage with someone I cannot and do talk to anymore, can show just how much of an oddity I am. The single mother here is usually a poor creature left alone after the inevitable death of her geriatric husband, or the woman who was not quite up to snuff..who's tea was served just a little bit colder than it should have been. But the woman who would choose of her own volition to serperate herself from the protection of a husband regardless of his character or lack thereof is a woman scorned for her un-ladylike independance.
I don't care where you live, or how much of a forward thinking..freedom and equality and justice for all kind of place it is. The fact is anything other than the husband and wife and kids scenario is called "a non traditional family"
Tradition being defined as a societal norm transmitted through time by being taught.
It is not, therefore, a ritual or belief that is worth being passed down..it is not something that they want to give for safe keeping.
So, when they label you a "non-traditional family", it's just their way of saying it's not something they want to keep.