You never know - sometimes people have been "trained" by relatives with very nosy babies who get distracted when someone talks to Mom.
My weirdest experience was out with the family, feeding dd2 in a sandwich shop, when a man in his 50's came over and started gushing (rather loudly) about how wonderful it was what I was doing, and how great for dd, and on, and on...I really didn't want all that attention.
Then he handed my dh a flyer about joining his commune!