I think there's a difference between critically observing and judging though - I will critically observe a friend's parenting. I don't like that her children drink cola but I do like that CCing is seen as a bad thing and therefore we can share other ideas together. I choose not to let DS have any drink bar water or milk: at Nursery they give him very dilute juice in a sippy cup. At home, he has a big-boy cup. DS knows the difference and is OK with it. He'd rather have a big-boy cup than juice any day!
I will see a friend swears at her children, but also see that she swears in normal conversation. Now, I dislike swearing and don't use those words. Can I judge her for having heard and used those words all her life and not seeing a problem with them? No. I can decide not to do that with my child though, without judging.
I will see a friend so desperate for a "big family" she ignores the needs of her daughter so her husband will agree that children are "easy" and they'll have another. I disagree with her methods; I'd like a big family but it ain't gonna happen now! I can't ignore DS's needs because of what I think I want in 10-20 years' time. My friend can. Interestingly, she thinks she's doing better than me because she's a SAHM and I work... we both disagree with the other's parenting. Interesting to see how the children turn out!
And I win "bad parent medal" here for just being very relaxed about parenting and not researching it! I just know that DS has needs, as does every person, and it's my main job to get those needs and some/most of those wants met. I didn't need to research what I do because I am happy with my choices. When DS was very little I refused to give him a bottle and made him have formula in a cup so that he wouldn't decide BFing was too much effort when the bottle is easy. The cup was harder so BFing was a bit more successful. And yes, after a week, he was given bottles anyway, but by then we were BFing fairly well.
I have read parenting books. Quite a lot. I like reading and had a few lent to me. But I still ignored what was said if I didn't think it sounded like what I wanted to do! I suppose I parent with the view of "if I were DS, what do I need to happen?". Today, DS needed to go to Nursery while I study at home: he's tired and I'm tired (up for over 4 hours until gone 6am this morning so the lie-in until a quarter to nine wasn't that wonderful) and he wouldn't play alone and let me study so I'd get snappy and he'd be whingy because he wants to play outside with friends... Win/Win: I can study in peace and have a few breaks from study that don't involve trains and DS can have all trains and friends and happy, rested people around him. I don't need a book or a study to tell me that's the right thing to do! But I know other people would think that a "snow day" means I should have DS with me and enjoy his company... which I have already enjoyed enough today, in my eyes, but I suppose I could have done that if I had wanted to. Or had anyone nearby who'd take DS out for an hour so I could sleep after lunch LOL.

