Just happened on this multi-vehicle pile up.
As a father, and grandfather of girls I became very aware that breast feed babies need feeding frequently and are not particular as to place. Just as getting a bottle to one hungry child satisfies it's needs another needs Mum's breast. Seeing a contented baby being feed is one of life's better moments. As for exhibitionism I've never seen such in relation to breast feeding.
In terms of the tasteless display of too much flesh there are sadly many examples but breast feeding is not one of them, in my book. Women do not always find breast feeding easy and harassment from those who ought to know better helps neither child nor parent.
Mums, carry on. Your baby's needs outweigh the outrage of your critics.