I disagree somewhat. I started on an electric but made most of my development when I saved up and purchased an acoustic. Why?
I put it down to the fact that with the electric, theres always the hassle of plugging it in and setting it up. Plus, its naturally a heavier object and less desirable to always pick up and muck around with. I find myself taking the acoustic to whereever I am in the house, my room, the kitchen, watching TV, friends houses, etc. Its just inherently much more convenient to practice on an acoustic.
Also, as this guy is a beginner, its much cheaper, and hes not even sure if he wants to stick at it yet. If he finds himself enjoying the guitar, he will be sure to pick up an electric down the track.