Oh a Boy and a Girl, Perfect - You Must Be Done Having Kids?

I find this question so irritating for some reason. Yes, I have a boy and a girl, but why would someone assume I am done having kids? I mean I may very well be done, but I have never thought to tell someone who has a boy and a girl (singleton pregnancy) that they must be done because they have one of each...lol! I don't know, it may just be me, but some of the questions you get with having twins are so unbelievably personal and people have no idea how rude they are.