I tried and failed to breast feed all three of mine, and I found the opinions expressed by the OP, and in the early part of the thread, to be very painful and hurtful.
I tried everything I could think of with ds1. He had neonatal jaundice, and I was told I had to supplement him with formula, because of this (I know now that this might well have been the wrong advice, but then, as a very new mum, with my baby in an incubator, having phototherapy, I wasn't going to argue). I tried to reestablish breast feeding when we got home, and even expressed after every feed, as that was suggested as something that might boost my supply. I did this for 10 days - on day 1 I expressed 4.5mls, and by day 10 this had increased dramatically to .... 4.5mls. Ds1 wasn't gaining weight, and I reluctantly switched to formula. I suspect this played a part in me getting PND.
With ds2, I was even more determined to bf. I had him at home, no jaundice, and he was ebf - he fed loads - sometimes it felt like he was always feeding - and yet he did not regain the 10oz he'd lost from his birthweight. I had the HV coming round daily or every other day, wanting to see weight gain, and seeing none - and telling me she recommended me to formula feed. When I said I was really committed tobf, she said that she had to think of the best interest of the child!
. I threw her out of the house and persevered with the bf, but at 6 weeks old he still hadn't regained the weight, and when he was admitted to hospital with a chest infection, they diagnosed him as Failure To Thrive, and kept us in until I started to ff, and he started to gain some weight.
With ds3, I mixed fed from the word go - bf all day, a bottle late at night and one in the night - and he gained weight. When I dropped to one bottle a day, he stopped gaining weight. But I did manage to carry on with some bf for 12 weeks.
Maybe I had bad advice, I don't know, and maybe I am wrong, but my gut reaction was that I was not making enough milk or good enough milk - and it tore me apart. OP - maybe your friend is feeling as bad as I did about not breast feeding - I can tell you for sure that, if I had had a friend who judged me as you are judging your friend, it would have devastated me, at a point in my life when I was at rock bottom, and contemplating suicide.