havent had time to read all the posts jenbird, but I 'sort' of know what you mean, but I also know why your friend said what she did...
I unsuccessfully tried to BF my first born, failed dismally & gave up and switched to formula after 4 wks. I genuinely thought that I didnt have enough milk, so that is what I told everyone (DC1 was permanently hungry after each feed).
I then went on to successfully BF my 2nd & 3rd babies (still going strong with DC3 at 11months old) - and, with the beautiful benefit of hindsight, realise that of course I had enough bloody milk with DC1, he was just getting his latch all wrong, couldn't get enough milk out of me, my nipples hurt to buggery, bled everywhere etc etc, so I gave up.
It too slightly grates me when people say 'oh I didnt have enough milk', because i now know that virtually everyone has enough milk if you just keep feeding and feeding and feeding. But for first timers who get latch wrong, or ladies who have c-sections (I had a c-section with my third and found BF WAY harder to establish than with my 2nd), BF can be really bloody tough.
I always tell people don't worry if you can't do it with one baby - it certainly doesnt mean you wont be able to with subsequent babies.
BUt yes, i agree, the 'i don't have enough milk' comment is just, unfortunately, lack of knowledge / experience or poor education from HCPs.
Oh, and I would like to pen a book called "things they don't tell you about BF".... HCPs bang on about how great it is etc etc, but they fail to tell you that it usually bloody hurts for at least 2 weeks in the beginning, BF after c-sect is tough & different to BF after vaginal delivery, umm... no-one else can help feed you baby, you might feel claustrophobic having your little bundle permanently attached to you etc etc etc...the list goes on!!!