When interacting with the people you game with, either face to face, on chat programs like vent or teamspeak, in chatrooms or on forums; a good rule of thumb to live by is don't be a dick or, d.b.a.d. We all have our own personalities, thoughts and opinions. We often have the chance to voice those opinions but, just because you can say something, it doesn't necessarily mean you should.
Recently, in World of Warcraft, we had a great example of why d.b.a.d. should always be followed. It's raid night and, on vent, a guildie gets vocal about a specific class/talent combo, one he's not fond of. It would have been fine, except the reason he got vocal about it was because he hated this class/talent combo (discipline priest to be exact) and the person he apparently felt personified what was the very worst about this particular combo was on our raid AND she was one of the main tank healers, as she is every week. To make matters worse, she is sitting there on vent while he is being very insulting. A clear case of a player being a dick in a situation that made it even more uncalled for and rude.
People often forget that there are real people sitting on the other side of the computer screen, even when we are talking to them and hearing their voices. We lose sight sometimes of the fact that sometimes the things were say are, at the very least, rude and, at the very worst, hurtful. These kinds of things make for uncomfortable and, sometimes, unwelcome gaming environments. We don't all have to be friends. We don't even have to like each other but, we should always at least try to respect each other, especially when we so very often spend time in 'close quarters' as it were.
So, the lesson here is don't be a dick. Have respect for your fellow gamers whether they are sitting across the table or across the country. You'll be doing not only your fellow gamers a huge favor but, also, yourself .