Kudos to the parents for keeping their cool. The crazy Prius driver was so "wronged" by the noise and exhaust from his truck that she felt compelled to provoke others.
The motor is too loud? Cry me a freaking river.
I especially liked when she insisted that the diesel owners were uneducated. Ugh. She probably thinks that her Prius is singlehandedly restoring the atmosphere.
The South Park "Smug" episode rings clearly.
Where I live, that video would have ended rather differently- complete with cubic meters of solid black smoke and banjo music.