as pete said get out before them as they open the door and they've got one leg out boot the fucker shut that'll stop them getting out and gobbing off if not the gobbing off just clump 'em right in face.. that should do it.
i've never had road rage really only the odd twat in town at nite shouting but there normaly about 14 so just drive past with the window open and wheel brace in ya hand they normaly stop shouting than..