The right to freedom of speech allows individuals to express themselves without interference or constraint by the government. The Supreme Court has also recognized that the government may prohibit some speech that may cause a breach of the peace or cause violence.
It seems that Dougie Houser Dweebster was flaming mad for being cramped in his Geo Metro while stuck in Construction Traffic. So he feels the need to express himself to some beefy 260lb Conan the Construction Worker by giving Conan the Middle Finger. A construction worker who hasn't a single iota what Dweeby's issue may be as he was just working for the public safety department. Doesn't this constitute inciting violence?
Construction workers in western Pennsylvania must be softies for the ones I know out of Philadelphia and South Jersey would have granted Dweeby "Flip for Flip" justice. By turning his Geo Metro on it's backside like a box turtle with Dweeb-boy still in it!