It's bad to make obscene gestures to people.
James was driving to work when another driver cut him off on the freeway.
James wants the other driver to feel bad about their behavior.
James follows the other driver to their destination and lectures them about their behavior.
James puts alongside the other driver and raises his middle finger at him.
The other driver is clearly uncomfortable and tries to get James to leave.
The other driver swears at James and says he's the worst driver he's ever seen.