I didn't read the article about the 10-year-old, but I'm wondering if he had some sort of mental challenge where he couldn't distinguish the difference.
Since the boy and his family live in Western Washington, this story got a bit of coverage in the Seattle area (I live about a half hour or so from Seattle). According to local reports, the boy was described as, a "really energetic kid, hyper kid and really outgoing" by a neighbor.
His mother apparently worked for one of the local stations, and the boy appeared last fall on a local afternoon talk show program, where he was able to show off his cooking skills.
From what was written, it doesn't appear that he had any mental challenges. However, since I didn't know him personally, I can't say anything for sure.