Really? That is now the international symbol for "Let's go!"?
I've honked my horn at other drivers when they drifted into my lane, and in other cases when they've put me at risk. Never got in a fight because of it. I've also had horns honked at me when I've done the same. It's what horns are for.
Someone cuts me off, I'll give 'em a gesture and ignore 'em afterwards. That's as far as I go. Never had a problem with it.
If we can't express displeasure with other's behavior without risking a life/death struggle, what's that say about our nation. Everyone is so touchy these days…
I have talked to a couple rough and tumble mechanical/electrical contractors in my previous job that said a middle finger from someone meant "we are going to pull over and fight" and they would follow people arpund and try to get them out of the vehicle to fight them if they were flipped off. They were pretty loco.
Its not the majority, but some people are just crazy.