"A mother should not weaken if the baby cries so much it vomits" OMG !
OMG, there is something out there that has been published that actually says this?? That's so awful!

I find it is most often people who don't have any children that come up with suggestions like CC (well, that seems to be my experience anyway). To deal with it, I just avoid the topic. If someone asks if DD sleeps through the night, I answer "yes" (that's actually true now, but it took several months to get there). I find the best solution if someone whose opinion you don't want asks you about your parenting decisions is to just say something vague and change the topic. Ask the friend/relative/acquaintance, etc something about themselves, act interested in what they have to say, and they will soon forget they were asking about your bub in the first place.