I've been guilty a couple times myself. One time, the guy was up next to me at the next light and I waved as if to say I'm sorry, he rolled down his window and started bitching and I just looked at him and let him vent and then said, Hey Man, I'm sorry, just didn't see you, I'm sure glad you were paying attention and saved my ass, so thanks. He then said, It's all good man, no worries.
I bet he felt like an ass for going off and bitching and name calling and **** which went in one ear and out the other. This is why I try not to get pist off these days and give benefit of the doubt when I can. Not everyone is an ******* driver. I know some cars have pillars in bad spots and they can't see you sometimes. That's why it's important to be a defensive driver.