> I also find when I have a real disagreement with someone, it's a lot easier when you're face-to-face. For instance, I have friends who are religious, in a real way, ie they actually think there's a god who created the earth and wants us to live a certain way. Being there in person keeps me from ridiculing them like I might on an internet forum, but it also keeps them from condemning me to hell.

My life experience differs: I, for example, am likely more disagreeable in real life than on the internet. :-)

In internet forums, all answers are "delayed" (since you have to put them into a coherent text). Thus you rather have to think through your arguments, and thus react less on impulse (the impulse is typically already over when you have finalized your post). On the other hand, in real life, things that you strongly disagree with might trigger a very spontaneous emotional reaction.

Also, in internet forums, you want to "win internet points". Thus, you only tangentially write your arguments for the counterpart (who you will likely not convince), but more importantly to convince the many people who read your post. So your arguments are better well-thought and well-researched.

In real life, there is often no additional audience to appreciate and be convinced by "your great arguments" ;-) so it's an "all-or-nothing" to bring the truth to this ignorant being. Since the counterpart has such as "stupid" opinion, rational arguments are likely not the best way for this (because if the counterpart was capable of rational thinking, they would immediately see how "stupid" their opinion is ;-) ), so you better "hammer" your arguments into the counterpart. :-)

Skill issue. Or social anxiety. Ask me how I know!