I don't know. Maybe I'm too much of a "rules lawyer", then. It just gets me when I'm playing a game and someone does something other than what's proscribed to happen by the rules, even if it's a little thing.
This has happened to me with other games also. At GenCon I got into a serious argument playing Magic with someone (in a multiplayer game) about what happens when a player loses the game with an Oblivion Ring in play. (The permanent removed by the Oblivion Ring never returns, because the leaves play ability can't go on the stack, because the player who would control that ability isn't in the game.) It wasn't super-relevant to the outcome of that game, but I couldn't help but be like, "Come on! There are rules to this game; I want to play the game described by these rules."
And yeah, I'm also the guy who wants to see your Treasure when you buy something. I hate when people just dump their whole hand in their discard and pick up a Gold, silently.
Don't worry, man, you're not alone.
I mean, if you're getting into a real argument, it's usually because the other person also knows/cares about rules; I see nothing wrong with discussing and resolving the issue. I usually want to do that just to make sure I understand the correct rule, anyway. I do overlook small mistakes from players who are *just* learning, though - I find trying to correct those immediately can be confusing if they don't already grasp the basics.
Counting treasure is also important to me, not because I think people want to cheat, but because we all make mistakes all the time. I try to model / teach players to show all their money, say how much they have, and then what they're doing with it. It just makes the whole game smoother for everybody. And it helps prevent the whole "what did you do on your turn?" issue.