DO respect other forum members' opinions, even if they differ from your own.
DO NOT deliberately start arguments. This is known as "trolling". It is usually very easy to spot, and offending threads will be locked or deleted.
DO NOT make sarcastic comments or imply that a thread is "boring" just because it doesn't interest you. If it doesn't interest you, please simply ignore the thread. If a particular user appears to irritate you on a regular basis, use the "Ignore User" feature.