as long as his parents made sure he wasnt, you know, acting out the games in real life, I don' really mind.
what i do mind is when these kids have online gaming. the people online are generally worse than the games themselves, and much more corrupting. there are countless audio tracks (with video) of little kids cussing out their parents and generally acting like dicks while they're on xbox live. they hear the older gamers talk like that, start annoying them, and then start doing what they do. At that point, they get some sort of hivemind going and wont stop.