I had nothing but support from mw's when I was trying to bf my two.
With ds1 my breasts didn't change at all in pregnancy, which I didn't think was that odd at the time. I had an awful birth and lost a lot of blood so was quite ill for days. My milk never 'came in' and other than a teeny amount of colostrum, ds1 wasn't getting anything so I had to start ff after about 3 days. The mw's I dealt with then were supportive, sympathetic because they believed it was because i'd been so ill that I just didn't produce milk.
With ds2 I was determined to try again. This time I had an amazing birth and was fighting fit an hour after he was born. So I started to bf again, but again not much happened. His latch was perfect so we were discharged after a day and I was told my milk would come in soon.
After 4 days, I was feeding every hour but ds1 was just screaming and screaming. I tried expressing and nothing came out. When the mw visited she poked and prodded and squeezed but could get nothing out at all and told me she thought I might have breast hypoplasia (very rare, not enough glandular tissue which often results in no or minimal milk production) and that I could keep trying, just in case, but should ff.
I continued trying for another week or so, but also gave ff. After a full 10 days and still couldn't get a drop of milk out I stopped. My breasts never changed size or shape from 4 weeks pregnant to having a 10 day old baby.
My MUM and MIL on the other hand...wow. I nearly went nc with them for the way they treated me with ds2. With ds1 I was 'ill'...could hardly stand for days, severely anaemic...so they both accepted I wasn't producing milk (which we thought was the cause the first time round) and stayed quiet.
With ds2 though, I was fine in myself. So I should have been able to bf. All this breast hypoplasia 'rubbish' was just an excuse and anyone could bf, I just wasn't trying hard enough. Bastards.
I never make a meal out of it, but I have been asked before in rl why I 'chose not to' bf, and i'll give an honest answer, that I didn't choose, I have breast hypoplasia which means i'm unable to. Maybe i'm a little paranoid, but I always get a 'Mmm if you say so' type response as if people obviously know i'm making excuses and chatting shit.
It seems more acceptable to say you don't want to iyswim - but are completed unbelieved if you genuinely can't.