The claim that SpongeBob makes your child dumber is a causal claim. If you do X, Y will happen. To prove that, you'd have to show that if you forced the children in the no-TV households to watch SpongeBob and changed nothing else about their lives, they would do worse in school.
Lovingly crafted and super-creative cupcakes are not exactly on tap in my household after a full day at work, and I do not blame my mother for a second that they were not on tap in hers, either.
I think women - relative to men - tend to feel that they have to do the household chores on top of everything else. This becomes even worse once you have kids. It's enough to have a full time job; a full time job plus a family is even more.