nursing baby in public

so I was sitting outside a child's store with my 4 month old feeding her and the funny thing is on the sign right above my head is a breastfeeding is always welcome here sign. this lady comes up and says that's disgusting cover up. (this lady was wearing a crop crop top like bra crop top and booty shorts) my response came out of nowhere * sorry mam but your lard is showing and it's disgusting can you please cover up its making my daughter loose her appetite"