I am taking the point of those who think it misogenistic. I am not going to dismiss it because a.this isnt netmums and b. there is something to it (IMO)
As for it being funny.
Personally I think it is. The OP is saying stuff that I have seen on the boards over and over. There are an awful lot of funny women on MNs who make very sharp comments if someone is getting all 4X4'y and banging on about nannies (home made pasta anyone?).
So she could have lifted that stuff straight from the pages of MNs. That could make her a lazy arse.
I laughed, I recognised MNs.
But as I said before I am so far removed from the sterotype she was laughing at, I suppose it was easy for me to laugh.
If she had been banging on about women with brown kids, benefits, wishing they could afford a nice bit of CK oilcloth, feeding their kids unorganic food etc etc
I probably would have been more 
But there are plenty of comics who do that already. Vikki Pollard? Vair Hilaire if you are a public school boy with lots of money.
Lets poke the prols and see what happens.
But thats another thread I suppose.