Not sexist, but you're wrong.
Child support should represent the minimum acceptable contribution of the non-custodial parent (father, in the vast majority of cases) to the child's welfare. Should he contribute a lot more, in cash, gifts, and college support? Absolutely. I would. However, the government shouldn't require him to do so, and the spending should be at his discretion. Right now, that freedom is completely taken away. The custodial parent should not be getting a huge check and the freedom to spend the money however she wants. If I end up having a kid with a wife who divorces me to live it up with an illiterate biker, those CS payments damn better be going to the kid's college, not her beau's lottery-ticket budget.
It's a bizarre inconsistency. Parents can stay married and financially neglect their children. They can make $300k combined per year and still refuse to pay for their kids' college. Yet, if they divorce, the one parent who rarely sees the kids (usually father) is forced not to pay up merely to the minimum level of decency, but far beyond that if he's "rich" like the article's author.