I mean that a traditional family is seen as somewhat counter-cultural today. I don't mean that this is literally a central topic for /pol/.

....is it? I don't know any non-traditional families and I'm in a pretty metropolitan social circle.

For some context for those interested: It's not entirely clear what "traditional family" means, but a plausible definition is married parents with children, where the husband is employed but the wife is not. (This is the direct sense implied by the context of the post originating this discussion, but is also the definition used by many other sources.)

According to the Bureau of Labor Statistics at https://www.bls.gov/news.release/famee.t04.htm there were ~7 million families in the United States fitting this definition in 2016, which corresponds to approximately 20% of families with children (and thus fewer than 10% of families total). Among said families with children, it is twice as common to have both husband and wife employed (~40%), and it is slightly more common to have a mother with no opposite-sex spouse present (~25%) -- though she may be unemployed.

I was unable to find statistics as to the geographic distribution of different family structures, eg whether they are more or less likely to live in metropolitan or rural areas.