This was really funny!
I realized that I would not say we were chatting about culture. Simply because the subject feels so heavy and serious I would rather choose to say we spoke about culture or we talked about culture. And the same goes for Swedish. Vi snackade om kultur sounds wrong in my ears, whereas vi pratade om kultur is a bit better, but I think that I would be most likely to say vi talade om kultur. :D
This might not answer your question, though.