If the driver of the SUV is not tracked down and arrested for stopping traffic, because the SUV was what actually blocked traffic, then SC was not arrested for his part in stopping traffic.
If SC became compliant, polite even, immediately upon becoming aware of the protest of the officer, then it was not his behavior after the officer stepped in that warranted the arrest.
Then SC was arrested for what is left (i.e being loud, and using profanity).
Heaven help us. "RAMMA JAMMA YELLA HAMMA GIVE HELL ALABAMA!" is an arrestable offense in Tuscaloosa.