womble I'm so sorry you feel so bad :(
I'm not going because I'm working, but I would (I live near Leeds) because on balance I really like the idea. Normally I'm not keen on BFing sit-in type things but usually they are a complaint about someone having a bad time in a cafe or similar, whereas this is more of a celebration of breastfeeding.
Many people will have had an easy time (thank goodness) and many will have had a tough time but generally those who are still continuing are the lucky ones who have also had great support from people who really know what they're doing. Sadly that support is so lacking that the majority of people still don't manage to do BF when they really want to.
We want to change that, and we want to show how important BFing is to so many of us mums. We're not trying to "rub it in" or "be smug". There's nothing smug about having battled through something and finally achieved it despite all odds, then wanting to help others who are approaching that situation. Sadly, this doesn't help those who have come to the point where things haven't worked out and that is something that all BFing advocates feel deeply frustrated about.
We do need to continue to wave the flag and continue the cause so that mums to be have a better chance. We spend a lot of time directly helping mums, almost always entirely for free - in fact at our cost for fuel, materials, time (when we could be working for financial gain) etc. Because we want to help mums.
We don't always get it right but we do always want to do it as well as we can.
If you were sitting next to me and you pulled out a bottle, I'd be so proud to have you there. I'd assume that you were pro-breastfeeding, that you wanted (or want) to BF and to support others who want to, that either there was EBM in the bottle, or formula because you'd made an informed choice or you didn't have an option, or not enough of the right support, and that you were doing what was best for you.
I'm not naive enough to think that no one there may be rude about it but IMO that person has no right whatsoever to be in the group. It's about supporting mums to feed their babies. Anyone who thinks differently, or who would not support EVERY mum has no right to attempt infant feeding promotion.
I hope this post reads the way I intend it. Hugs to you xxx