Legally protected, maybe. But, in this instance, it seems like a reasonable request for the mother to observe some degree of propriety and decorum in the confined space in which this took place. Just seems to be common sense...
But, common sense is in pretty short supply these days.
In my experience common sense is one of the rarer things in the Universe.
I certainly agree with you and I have been a nursing mother...lots of things are legally protected, that doesn’t make it right ....