8. Challenge them on failing to respond.
Everybody gets tired when an argument has gone on for awhile, but if at all possible, stick with it until they surrender. Remember, you have more and superior arguments. I find that most Leftists simply give up when they have no response, which is very telling for those who might read the exchange. You could allow someone to withdraw quietly and gracefully, but I always challenge the defiant departure. Example: “I’m done with this crap!”
No, they’re not done. They wanted to throw a parting punch, so return the favor. Ask what is “crap” about debating an issue. Point out that it appears they have no further proof of their claims. Whatever you have to do, don’t let the defiant quitter get away with it. And if they pop up again after the petulant “I’m done” (as they almost always do) — feel free to say “I thought you were done!”
Next: pitchin’ a fit…