I would have just shook my head (more of a "whatever" nod, not a "you're right" nod), maybe add a face palm. Or... would have just ignored. Full face helmets with a mirrored visor are good for that sort of thing. The idiocy and hypocrisy of the "make us look bad" while being total assholes to everyone around them (do ya really need to blip the throttle at a light (or even starting up), will the engine die otherwise?).
Exploring California by motorcycle and bicycle, one road at time.