I don't think it's right to refuse to answer questions about bottle-feeding because if the mother works or has a problem nursing, then what is she going to do? My friend could/would/did only nurse for 2 weeks, because she said it hurt her too much. So she switched to formula.
As someone mentioned before, I have less of a problem with mother nursing un-covered than I do with most of the current fashions, where the shirts are held together with a safety pin and some scotch tape. I'm not terrible modest and I'm not a prude, but I do believe in practibility. If you're going to wear clothes, then wear clothes. Not a couple of handkerchiefs.
I fully plan on breast-feeding my kids and I will do it in public with no shame. (probably will bring a cover, but that's for those jerk perverts). If somone is that uncomfortable with my nursing my child, then they shouldn't be staring at me to begin with. I avert my eyes when I see a woman nursing, just for the sake of privacy.