I agree with you although I reserve the right for exceptional circumtances to mumble a low volume criticism, e.g. in Quantum of Solace after the parachute escape from the plane I issued an involuntary "No Way!", this was not my fault, a simple passing understanding of gravity demanded it.
Outside of this patrons of a cinema should endeavour to keep as low profile as possible, if I don't know that you exist; then you are on the right track.