1) Golden rule You cant win so don't try.
I learnt this lesson a long time ago don't argue with someone who believes there right no mater what, Once whilst sitting on milk crates drinking beers and chatting bikes a argument started about some trivial fact I was sure I was right some as the other bloke. I went inside a produce a book with trivial facts inside I asked him to read the paragraph pertaining to the fact and without blinking he then told me the book was wrong. I got up got fresh beers and changed the subject.
2) Don't try and out smart them.
This is a bit like rule #1 they will drag you down to there level were they know they can out smart you and do so.
3) Don't encourage them
They love attention even negative attention so even when your poking fun at them they still win.
4) If you must win don't post in there threads this drives them nuts there just busting to roll out trivial facts and show you how clever they are. Hit the back button and move on. If there thread pisses you really off and you want to give them a keyboard full please re read rules.
Cheers Slake