I'm always surprised to hear about the kinds of things riders say cagers do to them when lane sharing (respects to TWN). I never run into any of that stuff. I mean, my lane sharing reality is so wildly different from what I'm reading here (spitting, squeezed into trucks, weaving, arm coming out, etc.) that it almost sounds apocryphal to me, like what out-of-staters with no sharing experience would imagine the daily life of a Cali commuter to be like. LA cagers must be some real nutsoids. And they call it LAX....
On the subject of throwing sh*t at people, or just generally even making eye contact with aggressive drivers, I've got another reason not to do it: because getting into **** with cagers puts the rider into such a frantic emotional state that he or she (though you probably need testosterone to get into **** with cagers) abandons all the important accident avoidance strategies, from perception to speed, and bad decision-making climbs exponentially. I guarantee you, if a cager wants to run you down and kill you, he or she will succeed, because they will run everyone else off the road to "win."
And finally, I would not give a DA fodder by asserting in a public forum that I throw "missiles" at other vehicles. I think the best defense is that you took the high road, and I don't mean literally.