It seems clear to me that the heated responses are the result of some posters feeling that they *already* make the sacrifices the OP detailed in her original post, and are yet still unable to make it on one income. I know, because I fall into that same boat - my family does all the things the OP described (except that we currently do not have a LO in diapers, and we NEVER take vacations, except ones that are free, i.e., to my parents' lake house where everything but the gas money to get there is paid for), and then some.
We still could not make it on my DH's salary alone. Even subtracting the portion of my salary that results from working (child care, one extra car, the occasional need to purchase additional convenience foods, etc.), my salary goes partly to cover things like groceries and our (modest) mortgage. It also covers our health insurance, except for $250 per month which we pay out of pocket. I can't imagine having to live on his salary alone (we could not - it is not enough to cover basics like mortgage, taxes, food) and then have to find a way to pay for health insurance on top of it.
It's really hard to hear how others are making ends meet on one income, when you want that for yourself so badly, and then not to feel defensive.
That said, I love this forum - a source of wonderful ideas and inspiration! - and I am delighted for the OP that she is able to scale back, derive pleasure from her lifestyle, find support from her DH, not feel deprived, and most of all, be content in her frugality. I was not offended by the post, but admit that it made me feel a little defensive in regard to my own situation. I think that same defensiveness accounts for a good number of the posts we saw in this thread. I'm hoping the OP can take that into account (and kudos, OP to you for remaining calm and for not getting too defensive!) in thinking about why some posters may have seemed hostile or judgmental.
I, too, am still giggling at the comment about the corporate picnics and grabbing women by their childbearing hips.