Passenger is speaking in calm, moderated tones.

Manager says 'can you calm down here'.

This is common tactic in my experience; I become even more calm, quiet, and exacting in my speech when stressed, yet I am often told to 'calm down' when I try and point out something (such as when I explain that I am medically unable to use the MMW, but am told that I am 'opting out')


Using that phrase makes it sound as if the passenger is behaving inappropriately, which isn't the case.