Without access to contraceptives and sex education, it is impossible for women to make a decision about whether or not to have a kid. They can only choose whether or not to have sex; pregnancy just sometimes happens if they do. Good luck getting a 16 year old (any 16 year old) to make good decisions about sex.

By sarcastically pretending that this 16-year-old made an affirmative choice to become a parent, the parent is actually trying to shame her for having sex as a teenager.

This goes directly to the heart of the article's point. Rather than confront a system that places some people at a disadvantage (lack of access to birth control or childcare), it's easier to insinuate that a person's hard life is solely the result of their own bad decisions.