Rdp,
I think you are wrong and the previous poster is correct. In non-critical stages of flight a please or thankyou goes a long way cannot be misunderstood and helps to make the world go round. Our profession is anally retentive enough without anachronistic people advocating not saying please and thankyou. If the plane is on fire fair enough, there is a time and a place for everything but lets not discourage a little common sense and decency.