I totally sympathize with you! Seems like something like that happens to me at least once every couple of days. I usually just shake my head a little and let it pass. I remind myself that I'm dealing with a sub-IQ dolt that also happens to be behind the wheel of a couple of tons of steel that could cause a lot of damage. I swear that these days some people WOULD run you over if you just flipped them off. It's dangerous out there - no need to escalate small situations.

But that's just my opinion :-)