Well, he's obviously, and provably, wrong. Move along, people. We've already established plenty of times that claims like this are completely baseless, and even people who don't play games know that. (Most of them, anyway) It does always bug me when people say "If you come in and turn off the TV while your kids are gaming, they'll be angry!"
For Chirst's sake, if I was reading a book and you just came in and slammed it shut in my face, I'd be angry about that, too! Very REASONABLY angry.
Wow, people have actually came up with a million good examples of this already.