Don't argue if you don't think the other party is willing to listen to rational thought. You could have a water tight argument, but if the other member is not willing to understand it's wasted. That's the main problem I have with those sorts of sites, some people are so deeply rutted in their ways that they refute everything. This applies both ways of course, strive to understand the other sides point. I would also say that I agree with alot of what groundhog has to say on the matter of respecting your opponent.
