Well for several reasons.

1. You have to find someone who actually wants to have a good faith argument with you.

2. You have to be disciplined enough to only argue with them, as you will expend energy arguing with the 500 other commenters who are just trolling you.

3. Actually be able to go through your inbox and find the replies of the person you think is actually acting in good faith.

4. Be in the mood to argue in good faith. Which is unlikely from the begining, basically impossible at the end.