1) Even if there is an area where food is permitted that doesn't help. Babies need to often be fed on demand. It isn't possible for mothers of many to just jump up and run to a food permitted area to feed their babies. You'd have to get all of your children off of the play equipment and bring them in the the food permitted area to nurse your child and hope that the other kids don't melt down during the process.
2) It's important not to focus on whether or not we as breastfeeding mothers are considered a protected class. Save that for a lawyer. This is something we must make sure is a protected class, if you will, by applying pressure to the owners of any business that excludes breastfeeding or limits it in any way.
Should we just throw the law away then? We have the law for a reason and we should stand up for our rights to breastfeed and educate the employees and owners of any business that attemps to make our lives more difficult because we are breastfeeding.
Let me also point out that if we allow businesses to continue because we aren't a protected class then many women will stop breastfeeding babies and toddlers because they aren't considered to be doing something that is to be socially acceptable. All it takes for some women is to feel like they are doing something wrong, and they will quit.