calm - the way I have dealt with it and I know it's damned hard when you have lots of ignorant people around you (which I do) is to joke about it. I know they say sarcasm is the lowest form of wit, but I honestly found nothing else works other than me saying something silly back. Now I am not saying everyone should do this, it is just my personal way of dealing with my own situation.
My favourite one is a remark (received every time she visits) from a very good friend whom I have a lot of respect for and admire in many ways, an intellignet well-read woman. She is in her early 60's just retired, never married and has no children (not that any of this matters a bit).
She says "YellowRose you are setting up your DS for a life long obsession with boobs bf him for THIS long" ! To which I say EVERY man I have ever met has had a life long obsession with boobs, even the bottle fed ones". She is saying that bf a toddler, esp. a boy, is somehow sexual, which as we all know is a nonsense. She is a good friend, so I just joke with her and she takes it because she knows what I am like !
It's very hard though if these sorts of comments come from blood relations or in-laws or the OUT LAWS as I call mine The thing that disappoints me most is my mother's attitude to it as I love her deeply, but just can't agree with her on anything about raising kids. She thinks smacking is ok (weird as I don't ever remember her smacking me) and bf beyond a year is just plain stupid. Sarcasm doesn't work with my mum though so with her I just change the subject quickly and pretend I didn't hear whatever she said.
I just think bf needs a lot of confidence and it's a damned shame that we as mothers and fathers have to find ways to justify it. I always think I have better things to do with my life than have to justify how I choose to feed or raise my son.