I just stopped bfing L 2 weeks ago, shortly after she turned 18 months. From 11-18 months I was just bfing once/day when she woke. However, if it did come up in conversation (which it didn't much - I think most ppl would never have imagined I wld have still been bfing then) I did feel slightly embarrassed admitting that I was.. and was wary of how they might react.
There are so many things in parenting where you will get annoying comments from others (sleep training, discipline, eating habits...) I think this is just another one of those areas where ppl have strong views and/or the potential to say something annoying/offensive (perhaps without meaning to), esp perhaps some mums who FF their babies who may be a little defensive/guilty about not having bf (I am thinking of one of my friends in particular here..)
I wonder what a 'good' response/comment would be anyway, without sounding patronising!
Basically, I guess what I'm trying (not very concisely!) to say is stick to doing what you want to do and think is best for Z and try not to let other ppls comments get to you. I think it is inevitable with being a parent that ppl will saying things that annoy/offend us sometimes.
Claire - I love your response. LOL Sarcasm is usually the best way to close these kinds of 'conversations' isn't it!