Close minded, polarized, uber-competitive internet debaters annoy me...
Taking religion vs science as an example, I, personally, would like having a conversation about creationism vs evolution, or the merits and pitfalls of religious faith, for the sheer joy of discussing the subject, without dealing with all the emotional baggage people take into them.
Same for politics, discussions on race, sexual orientation, or any other "hot button" topic..
And it IS an internet thing.. Having a "debate" in real life is usually less shouting at each other, and more a point, counter point, counter counter point, nothing to lose by being wrong except learning something new kind of thing. The point isn't winning or losing the debate, or impressing your friends, the point is just having fun talking about things. We're all friends, after all...
I guess there's no friends on the internet, though...