[Sin]

For me, depending on the subject, its kind of like a sport.

I could start out fully confident that I'm right.
The other person could be sure that they're right too, except they just heard my mindblowingly convincing argument, so now they're hesitant on the presentation of their own side. This is about where the subject at hand becomes important. If I recognize that yes they are right but they hesitated & seem unsure, I'll try to convince them over to my side anyways.

If the subject is important enough, I'll not argue for the sake of exercising my verbal jousting skills... I'll just shut up & concede that yes they were correct.