gunsynd: My upbringing,I was taught to respect my Elders and especially Women..
I thought that may be the reason, not that it is a bad reason, I think many men should be taught that (some women could do with learning to show some respect to men as well, it's a two way thing). But as long as the discussion is done in a respectful way, then you really shouldn't feel like you have to just give in. As long as both treat it as a civilised discussion and treat each other's opinions with respect, then that should not spoil a good discussion.
Edit: I love how different topics evolve in this thread. We can start on one topic, that can lead to something related, or something completely different. Each only lasting a short time before a new topic appears. It makes for some very fun and interesting discussions. :-)