When I bf my two children I had a few negative comments but thinking back the majority were off women.
I had rushed into mcdonalds (I know but my dd was really screaming and it was freezing out and this was the nearest place) when I was sat down a woman on the table near by was giving me evil looks and called a younger boy (late teens) over and said to him that I was offending her and her husband should not have to look at that. The boy looked at me confused and said he didn't understand her husband looked mortified. She said 'that woman feeding her baby'.
The young boy looked at her and said 'well this is a place to eat miss and if someone feeding offends you I suggest you dont go to places where people eat or drink'
Sil used to give her husband daggers if he didn't leave the room when I was feeding and kept suggesting I express in front of visitors.
Many times over the years I have heard women say things like breasts are for your husband and while feeding is ok it should be done discreetly so other men do not see your breasts. But I can only think of the odd event when a man did something offensive about feeding I wondered if I was the only one who had experienced mostly women being funny about breastfeeding. What about others who has been most negative men or women?