The chance of being on the internet for an extended period and not running into a troll is 0%. I can tell you as a former forum admin, that there is no way to

The chance of being on the internet for an extended period and not running into a troll is 0%. I can tell you as a former forum admin, that there is no way to avoid these people showing up. The rules don't matter, banning them doesn't matter, being a calm and relaxing place won't matter either. What did matter is that the rules made sense and were followed indiscriminately by the mods and admins. It also helped to have a forum dedicated to spam and allowed for breaking of many rules (racism/harrassment and CP being excluded from the exception) My banlist over a million users was 20 people long. I don't consider this sum to be hard to handle and at 1.2m registered users (without a need to register to read), I think maybe the problem is actually in the rules/application. People hate feeling like they are being treated unfairly. We would also enforce the rules when racism was targeting white people.