Why wouldn't you have the same conversation with your boys?
Until they outlaw a foot of exposure of the breast on the red carpet at the Academy Awards, showing some breast while breastfeeding should not be an issue.
I will wholeheartedly agree that there are people that push the limits, just as there are those that do it in every area of life.
But seeing a bit of skin tissue that belongs to the breast should not be a problem, especially if you can pick up the latest People magazine and see more breast exposed on the red carpet than the typical breast feeding mother.
Face it, for many people, it is not the breast (that is just an excuse because more breast is exposed at your local beach with women in bikinis), it is seeing the baby suckling on the breast that causes issue. That is proven here in this thread by all the people that feel that children should not see it. Why not? They have seen more breast at the water parks in Disney, so it has to be the act of feeding that bothers the parents.
My boys can be topless at the beach, and I don't worry about girls grabbing their breasts (dd12 is in middle school). I will tell them that girls' breasts are considered private - hands off. I've had no issues with 99.9% of women I've seen breastfeeding - it's the .1% who are pushing the issues. I have no problem with my children seeing women breastfeeding - they've seen me do it, as well as many of my friends. A little skin is fine - it's the zeolots who expose way more than they have to that annoy me.