Or, how to not lose an argument
1. Don’t make assertions you don’t know, with certainty, to be true. If you’re pretty sure, say so, or provide the caveats that might prove you wrong.
2. Don’t let your opponent argue against a point that is only similar to yours. In other words: Don’t let your opponent misinterpret your points. If he gets it wrong, do not proceed until the confusion is corrected. If you don’t have a point, don’t get into an argument in the first place.
3. Watch out for differences of opinion and acknowledge them by ending the argument. Opinions are like assholes–everyone has one and there’s no point in talking about them.