I can't stand people who can't see the flaws in their own arguments, even when presented with them, to the point that they are essentially just ignoring everything you say and blindly carrying on. It seems worse that I was actually asked for my opinion - it seems he didn't want it afterall.

Obviously this is based on experience. The only thing worse was, the guy offered that 'we can always discuss it outside...' thing - and when I accepted, he suddenly lost confidence and hasn't spoken since... loser - seriously, dont threaten violence if you're not going to carry it through.

Whether it's valid or not I don't know, but to say I'm 'peeved' would be an understatement....