I breastfed in public for a total of nearly 8 years, both alone, with family, with friends and in groups.
I can't recall staff attitude making any difference to me or my breastfeeding friends.
Things that did make a difference was how big the cafe was, was there room to park buggies without them getting in other people's way, what the seats were like, were they plastic chairs or low sofas, did the chairs have arms that would make it difficult. did they serve nice nutritious food
Even the heights of the tables, was it easy to have toddlers there too, for those with older kids, what the changing facilities were like.
All these things mattered more than staff attitudes or whether someone was willing to bring me a glass of water.
I didn't give two hoots if places were "breastfeeding friendlY" or not.