Compared with a flag burner who was shocked, shocked and horrified, when a disabled Marine vet broke his nose.
Or (since I usually defend officers) an officer who challenges someone to hit him, expecting the fear of time in 'the hole' or additional charges to protect him, and is flabbergasted when the subject cleans his clock.
There's a stupid, self-centered, entitled mindset which believes that you have the right to fuck with anybody you want without consequences. Grow up. Doing this is playing with emotion and emotion in most societies leads to action. Don't believe because our culture is extremely polite and forgiving (and it is, despite various political beliefs) that you can safely provoke emotion without getting emotion.
The kid who was cutting off the driver was getting off on the power of making someone else angry. Drawing a gun was wrong, there will be consequences... but only a moron would be surprised that provoking anger led to- you guessed it- anger.
I don't mind killing a bear if it needs killing or you need meat, but if you torment an animal and get eaten, you had it coming.