> I don't really get this attitude, it means that nothing new will ever overcome anything that's been established.

I think he's trying to quote Dan Saks' "extern c: Talking to C Programmers about C++" when he said "If you're arguing, you've lost." Saks, at least, meant that if you're striving with someone, you've already lost because your partner is already in a "frame" of mind set against your arguments that is unbreakably strong, even by logic. The talk is really good just for that aspect.