I'm FF my daughter and i honestly don't think there is 'normal' way to feed our babies. We all do what we think is best and what we are able to do.

Meow- I don't think the mother intended to offend you she explained to her toddler the best way that they could understand. If she had of said the baby is feeding he would have asked why was the baby doing that and it would have been a matter of why, why, why and so she told him something he could understand right away. I have been there with my niece and was staring at a mother BF and i said the baby is having their breakfast/lunch/dinner whatever time of day it was and she looked a bit confused but then never said anything.