If you're going to ask a question that is openly available to the general public for answering, you can't justifiably exclude anyone with an opinion that doesn't validate your own opinions.
Many people view those who play online games for hours at a time as nerds or geeks or "no-lifers" because all those people do is sit in front of a computer screen and have no social interaction beyond cybersocializing. More often than not, the people that DO criticize those who "live" vicariously through a computer/online medium are people who are extroverted and gregarious and thrive of in-person social interaction.
However, there are those people who are extremely antisocial and basically despise being in the physical company of others (like myself) and prefer to restrict socializing to what is "required" via online gaming. I play games for the escapist aspect, and I abhor games that actively encourage player-to-player interaction. Online socializing allows one to set the rules, so to speak, for the interaction...you can talk or socialize when you want, and extricating yourself is as simple as one click, without having to make awkward and transparent excuses for why you want to be rid of someone's company.
Also, there are those who are physically incapable of socializing in the "real world" due to physical disabilities, and therefore spend much of their time engaging in social activities online so they can continue to feel like they are a functioning part of humanity.
Lastly, who cares what someone else thinks of you anyway?