I enjoy debating, and I try to be polite if the other person is being polite. And I have on occasion conceded defeat, only a few times though. If the other person is snarky with me, I will use every opportunity to slip in subtler insults and sarcastic comments, but after the debate, so long as their logic is not COMPLETELY insane, all is forgiven ^^
And this is the grand and massive anonymous internet, people are not always going to be nice, it is unfortunate, but there is bugger all you can do about it, makes it a more fun place XP