I agree! I do also support breastfeeding however and think that people should "get over it" if they are embarrassed about seeing a woman's breast with a baby attached, that is what they are FOR.
However, breast-feeding moms pulling down tube tops would just be a little shocking to most folks and is too extreme. I always found it was easier to "hide" you were nursing a baby by sliding the baby under a shirt that pulls up, not down or open, and the fabric itself covers your breast and the baby's mouth.
I became rather militant about this topic when, as a new first-time mother, I took my fussy newborn out of a restaurant and into their women's bathroom lounge, you know, where they sometimes have a little couch in the ladies room? I sat down on the nice little couch and proceeded to nurse my baby discreetly (NO tube tops, I had my whole front covered under a lacy shawl). A woman comes in and sees me and says in disgust...."I can't believe someone is nursing there baby in here." To her companion. I look up, a little shocked, and she says to me, "You should take your baby into the bathroom STALL to do this!" I have forevermore tried to picture what she described, sitting on the toilet and nursing her?
I certainly did NOT do that, instead I sat there with her and finished with steam coming out my ears.

But since I later nursed her to age one year and nursed both boys to almost two years of age, I used it as the story about ridiculous people whenever the topic of breastfeeding in public has come up. I think it was sad how out of touch that woman was with what the human body was designed for, and nursing your baby in a couch in a woman's restroom is certainly modest.
I found that while I could be more "open" about breastfeeding over time, people around me were never comfortable with it, even family members, so I always nursed my babies rather privately. I read that in Europe, people are more open about it, and in some third world countries, some babies are nursed until they were five! I took a lot of flack for nursing a two-year-old.

I'm not sure why that was so shocking.

But I have very fond memories of nursing all three of my children and feel sorry when I hear women choose not to use that method to feed their infants, it is such a wonderful bonding.