I actually agree with nerf, it wasn't until reading threads on mn that I got a real understanding of the extent of living with disability. I obviously knew the basics, but there's so much you wouldn't necessarily realise if you haven't had direct experience.
I wouldn't say happymummy's views are necessarily mainstream,but her lack of understanding is (although I'd have thought she'd have 'got it' by now).
That said, having just read the thread (because of this one) it definitely read as happymummy being shouted down by loads of posters - called names and told to fuck off - she didn't do that at all. Yes, she spouted the usual misinformed and deliberately misunderstanding crap that she does, but in the context of that thread alone it's the other posters that come out badly.