Say what you will. Personally I am very uncomfortable when I am in a restaurant and I see someone breast feeding. I have gotten up to leave before and I will continue to do that. Fortunately for me, it is a very rare occasion that this happens so I still continue to eat out on occasion. For me, there are activities that should not be done in a restaurant. These structures are intended for people to go and consume food that is prepared by the said establishment... not a mammary excretion station.
In other places such as buses, the park, department stores, and such, no problems what so ever, but in restaurants... yea, it's not something that I find acceptable. If this means that some people thing that I am a prehistoric overly conservative jerk, oh well.
I also don't think that I should be attacked for stating my personal opinion.