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a person who yells at people in e-mail threads like a madman with a megaphone and makes them all speak proper English or else they get sent to the gulag.
'I said "hello" not "hey" and you're all in the third row!', from a 3 a. m. e-mail rant
'You spelled "brunch" wrong and now you're banned from the group chat.'
'I'm not done with this thread until you all use semicolons.'