Personally, I wouldn't point my gun at anything I don't absolutely 100% don't intend to kill. I might take it out and keep it pointed at the ground if I am absolutely sure I may have to defend my life, but I know for certain that I can raise my firearm to aiming level much faster than someone can get out of their car.
Problems I can see with this scenario:
1.) You could have easily been charged with brandishing or, even a stretch, attempted felonious assault had someone called 911. (A Jim Simmons favorite)
2.) Any Anti can say "I have video proof I recorded on my phone and posted on YouTube that this gentleman was walking around pointing a gun at people." Personally, I try desperately not provide evidence that can be used against me and/or out of context. I'm sure anyone newly approaching the scene that could have saw this would be more apt to scream MWAG to the local authorities if the gun is pointed at someone, let alone just at the ground, when a man is screaming profanities.
3.) Just for fun: they don't use straight jackets anymore.
(I work at a Psychiatric hospital and do weekly take downs from Macomb County's finest. Four point restraints and Haldol 5mg, Ativan 2mg in an injection often do the trick to even the biggest and baddest.) I will say though, that I've definitely had my share of idiots go off on me for no reason. Chances are, they got escalated in the bar, and thought better of it, and decided to act like an orangutan outside rather than inside, and you just got the brunt of it.