This.
All establishments in recent years have built massive great big mother and baby rooms, after being told that it was essential to provide a space for feeding and changing. Perfectly reasonable.
But some people always got to go further. So if they feel like breastfeeding in the middle of McDonalds, around people eating food (the example above), then they will.
The points is consideration. This woman was offended after being asked to cover up, in consideration of others. She said, in a nutshell, "You have to consider my feelings but don't expect me to consider your feelings."