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I have been friends with a mmo player for a week or two now, talking to him every now and then in game. I then get a message from his mom saying thank you for being nice to my son, he is only 11 years old. I would have felt like a complete jerk if I would have been mean or blown him off when he messaged me a few times instead of replying to his tells and being nice. It was just a reminder to be nice to your fellow players, you never know who the real person behind the toon is.
You never know if that person you are talking to in MMOs is older, younger, male or female. Be nice and show respect to your fellow gamers, you don't know their story or where they come from in life. I have met many gamers over the years ranging from the ill who can't leave the house to others who were war vets who have suffered so many injuries in the past protecting our freedom that they can no longer function in the real world.
How about the kid who gets bullied at school and uses MMOs to escape that real life drama for a brief period of time and fit in with likeminded fellow gamers? How about that stressed out student or worker who needs a break from whatever it is they have going on in their life?
Whatever their story is, they all have stuff in common with not only each other, but you as well. They all enjoy playing the same game as you and they want to have fun playing it, being nice to them is a step in the right direction to help make that a reality.
Respect your fellow gamer.