A forum is essentially an on-line community where every member is anonymous. In normal communities, pet peeves can be met with face-to-face and fixed, but on the internet, you will be subjected to seeing the same person (or type of person) constantly do something that makes your teeth grind, and theres *nothing* you can do about it. What's yours? What's your forum pet peeve? Doesn't have to be about gaming
Mine is when people judge and analyze things they know nothing about. This happens a lot when discussing current events, but where I see it most is in discussions about music. A lot of people claim their opinion on music to be the right one, and don't take no for an answer. Having opinions about what type of music you prefer is ok, but when you start stating that someone else's choice in music is terrible, or their favorite band "sucks", when you yourself don't have the first clue on what basic music theory is, that just sends shivers up my spine.