well now . . .
Arguably we're into different territory in the 'replies', where main posts are discussed. The "opinion" I expressed in the main post isn't the same opinion I made in my reply to you. If you want to go off-board and get into a discussion, then the 'rules' change. Not my rules, but the rules of common sense.

Of course you can disagree, but disagreement only makes sense if both parties are basing their comments on mutually agreed parameters of discussion (and in a context of seriousness rather than broadly comedic site). If there is any 'rule', it's surely that posts are taken in the spirit in which they're offered. If someone posted about big tits and I replied that, actually, large breasts can be a great inconvenience to women, I'd be missing the point of the site.

Ultimately, the point is that this kind of extended discussion is of very little interest to anyone else. Which is why the Reply function was created in the the first place (to clear the main board of the tedious wankery you responded with and which I have foolishly extended through a combination of ego and boredom.)
(Brand name, Sun 14 Nov 2010, 12:45, Reply)