Instantly Bannable Offenses
These can be one-time bannable offenses for which you will not get a warning.
Insults. Direct personal insult of another member, i.e., "You are an idiot." and all the variations. Why? Because this isn't grade school. People should be able to discuss or even dispute other's posts without insulting people. And the only purpose of a post like this is to incite other people. You may dispute somebody's opinion, but not attack/flame the person who stated it. There are a lot of other non-direct-personal insults that won't necessary get you banned instantly, but depending on the context/nature may lead to post editing, post deletion, warnings, or time-outs. They include telling people to shut up, or being extremely or repeatedly rude or sarcastic. Bottom line -- don't try to tick off others. Although we do not read Private Messages sent between forum members, the rules for appropriate and inappropriate content apply to them as well.