I think what the parent comment was hinting at is that there is no absolute separator between a non-adult and an adult. It is a thousand different things and the type of game you enjoy playing is not necessarily a good indicator on its own.
I've heard many stories of parents that have their toddlers locked up in a room crying while mom is working and dad's home playing CoD.
The line is just obvious if you just use your head. Video games in particular has a serious mind-altering affect on men. (It's actually very similar to porn and both have been discussed on the internet at great extent).
