Mumsnet is one if the very places where I don't feel I have a set of rules to apply to, I often see negative comments about the regulars on FWR, I've only recently started posting but have lurked a very long time and I don't see the patronising thing.
Buffy's posts in particular, really changed my view on life, I read everyone's, but when I first started reading FWR it was Buffy's posts that challenged me, without her even knowing, and this is the first I've mentioned it, she's kind of changed my life, or at least my view on it, I've often typed a long message out saying thank you, and then deleted it because it never sounds right, and from reading the FWR section I've gotten confidence to use my voice, both online and in rl and I really can't thank everyone enough for that.
I've learned not to judge, and to actually listen to other angles, instead of dismissing them as "wrong" I would listen to things being discussed and make my assumptions, based on my life and my upbringing, which is wrong, I've come at things from my upbringing, from my experiences, and now I've learnt to actually think beyond the words someone is saying to me, and think about how they have reached the conclusion they have done, and while it might be different to mine, I have a new respect. Like others have mentioned, I also don't feel articulate enough to express what I'm trying to say, but I've never felt judged. Ever.
I think people, when reading the dissecting of issues, such as wearing make up or sah/woh read the posts tand then take it personally, as a critisicm, but I read it as looking at society and how/why we are where we are, type of thing.
I'm waffling now, but just wanted to say what the OP describes hasn't been my experience and I'm sorry that others have had negative experiences here.