Its shocking and disgraceful. I do a small teeny bit by being positive about BF to any woman, whether she's had children, pregnant or childless at the moment. My DC don't bat an eyelid if they see someone feeding, and I feed in front of their friends too when they come over. If they ask (age 4!)what I'm doing, I just tell them and they accept it.
But its such a TINY thing to do. I feel that I want to do something bigger but I don't knwo what! I'm not an expert on BF by any means, just a Mum.