Disagree with you. There is a very militant friend of mine who is real adamant about feeding anywhere, anytime, and around anyone. She shares posts on FB from a couple of support/advocacy groups she's involved with.
I had an experience during college with a woman at a small burger stand run by the school. I was sitting at a large table by myself one afternoon. Her husband went up to order while sat down opposite me with the infant. Didn't say a word, didn't use a coverup, and just suddenly and unexpectedly popped out a huge boob and started nursing her child. I was 19 and all I wanted to do was stare at her boobs. It was uncomfortable, to say the least.
As long as moms cover up, I'm fine. Just be discreet.