I'd argue the exact opposite. It's just a matter of being able to define "what really counts". Knowing the difference between fantasy and reality is a key component of that determination, I'd say.
You appear to be arguing that video games have a deleterious impact on morality.
No, I am not arguing that. I am arguing that online gaming has shown that social behavior really improves a lot when people run the risk of getting punched in the face. People are much more likely to cheat/exploit in a multiplayer game when they are anonymous and safe in their basement than when they play a multiplayer game in a pub.