It's fine, you're doing well. You just need a few comments back and forth, then you start your fourth comment with "well, actually I think you'll find...".

On the fifth comment, you need to attack a minor spelling or grammatical error they have made.

Sixth comment, try and sound like you're reasonable, and they're obviously not... then it's a race!

First person to compare their opponent to "basically Hitler" wins!

You should receive between 100 and 1000 argument XP, depending on the level of your opponent (you get about 10% more for a victory, but you can still level up if you lose every time).