When breasts are being used to sell food, booze, sports, clothing, etc. They are in certain settings. Everyone has become accustomed to seeing near topless women on television commercials, in certain restaurant ads, alcohol ads, sports ads and cheerleader outfits, and in designer dresses in front of cameras.
Now, an infant becomes hungry while the family is out to eat, the family is out catching a movie, or maybe the are just taking the children to the park to play. People get offended because a mother is taking care of her child's most basic need. You see less of this woman's breast than you do of a Hooters' gal or a cheerleader. Would you be as offended if she were changing the infant's diaper in the same spot so she could keep and eye on her other children?
Society is so sex-driven and deviant.
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From @brendad