1. T for Teen
2. Server population can be taken into account
3. Forums are a very, very vocal minority

Honestly, I found XIV's community to be the most civil, peaceful, and helpful I'd ever seen in years back when I only played on Sarg. Play on a less than overcrowded server and ignore the echo chamber that is the forums and it really changes things.

Also, forums are horrible by default for the fact that people are trying to get the most up boats for having "Ha! I bet I showed him!" levels of responses. The passive aggressiveness to skirt mods and reports only taints the population even further. Because apparently telling someone "You're a snarky little shite that needs to take your arse back to reddit" is too mean or something.