I guess it depends who you are talking to. If they are part of a group with not many kids then you do get the blank stare when you say SAHM. I actually am not a SAHM as DH and I have always split kid duties and then I work on top of that. But I used to say it just to see what the reaction is, and it was clear that the people I said it to were a bit taken aback and didn't know then what to say. DH does mostly caring duties now and he proudly says it when people ask what he does. The silence after that is even longer than when I say it. LOL