I face this sort of craziness while driving in Lagos. Developed a fowl mouth in the process. The crazy things people do without batting an eye unsettles me in more way than I can imagine.
You did the right thing by not engaging. Sorry but I have a stereotypical view about Americans and guns, and the scenario you just described looked at one that would involves guns if heated. Stay SAFU
I would probably be cussing people out all day if I yelled at every bad driver. Unfortunately you just don't know who is going to pull out a gun and shoot you over some dumb encounter. I keep thinking I might just move to England or somewhere else where every other person is carrying a weapon. It's all so stupid with the guns. I wish I could snap a finger and make them bleep out of existence.