I don't have a problem with it on a personal level, but I don't like it because usually the women who do it are low class attention seeking selfish monsters.
For instance; I went and saw a midnight movie premier afew years ago, a woman was sitting front row breast feeding her kid who was crying the entire film and she got uppity when someone told her to take t to the bathroom so we didn't have to hear the crying.
So in principal I don't have an issue with it but in practice I do because usually the women who do it have the worst and most selfish of attitudes. They act like the world revolves around them and their little kid and are inconsiderate of the feelings and wants of others.