I know what you mean - I got the same sort of thing, although was FF for different reasons.

I could say to ignore them, they're ignorant, rude, misinformed people - but I know that it does get to you. It makes you angry, upset and it makes you question the decisions you have made. You struggle to do the right thing for your child and make difficult choices and the last thing you need with a new baby is to be criticised for your choices. Take heart in knowing that you have made a decision that is in the very best interests of your baby and you. You're doing a great job and your baby is going to love you for being so strong. Good luck.

I was ignoring people's looks until I had one woman tell me how I should feel awful for giving my baby poison, and for being blinded by commercial messages. I lost it that day, and told her she was quite right and I would feel much better if I had followed the current belief of what was the "only way to feed a child" and continued breastfeeding, allowing my child to suffer enormous amounts of pain and then die from malnutrition, and it was such a weakness of mine as a mother that I wasn't strong enough to do that. That shut her up.