This is such a load of bullshit. No one has bashed the concept of stay at home moms.
What both Rosen and Maher were clearly referring to was the fact that Ann Romney has no idea what it is like to actually have to support a family and worry about things like paying bills, health insurance, etc.
And, sure, being a stay at home mom may be hard work, but let's not get carried away. It's not like getting up at 3 AM to work a shift running a garbage truck, or work a day as a farmhand bending over and picking fruit all day in the sweltering heat, or a social working dealing with special needs kids all fucking day.
If you can afford to be a stay at home mom (or dad), then you are probably doing okay. This is not reality of most people.