"if you don't like it then don't look at it"
It's all the same as with people who post "if you don't like this song then why'd you open the video?", how the hell are you supposed to magically know whether or not you like something, if it's required that you listen to it or see it or experience it? What that quote suggests is that you should've disliked it BEFORE you listened to it. And when somebody dislikes\likes something without actually knowing what it is, it's called being ignorant and narrow minded.
You can't control whether or not somebody breastfeeds in public so it's not like you can avoid looking at a woman breastfeeding in public unless you knew beforehand that she was there breastfeeding. 'If you don't like car accidents; avoid them' makes just as much sense as that phrase.
Either way, this has very little to do with breastfeeding. I don't care for breastfeeding, much like I don't care for politics or abortions. People want to breastfeed I don't care. This has to do with the logic behind the phrase, which to me is nonexistant. You're the one who brought breastfeeding into this.