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This page in a nutshell: Before you say "Calm down", reflect, think better of it. Calm down.
Telling editors to "calm down" or "keep calm" gets them worked up, and is also rude and condescending.
"Calm down" with a smiley isn't better; it's worse. It expresses "I realise telling somebody to calm down may come off as patronising, so I'll try to show with a nice smile that I'm really a nice person and mean no harm. I may be hamfisted and irritating, but I'm nice!"
