Well one trick, think before you post. "Is what I am about to post a positive contribution to the thread in any way? Is this going to piss allot of people off for obvious reasons?"
Next, if you're going to be factual, make sure those "facts" aren't pulled out of your ass. If you are uncertain, make it clear.
Also don't make a huge fuss over the stuff that happens here, sometimes you win, sometimes you lose. Don't let the trolling get to you either.
Finally, never under any circumstances call people names. It makes you look bad no matter who you are. The close relative to this rule is the one that says you should be nice to people unless they're digging into everyone's skulls. By that I mean people who are actively trolling and looking to piss everyone off on purpose to elevate themselves, I'm not talking about newbies or the kiddies that make all those stuffty posts that grind peoples' gears for god knows what reasons.
And yes all these supplemental rules of behavior tie into the first rule about thinking.