Red Pen Syndrome
The sufferers of this syndrome have an irrepressible urge to correct any and all grammar mistakes that come within their sight. At times this can be helpful, but at other times, it can be downright inappropriate and mean.
Jane: Hey! Take that apostrophe out of there!
Bob: What? Who are you?
Jane: I'm sorry, I have Red Pen Syndrome.
Bob: What? Who are you?
Jane: I'm sorry, I have Red Pen Syndrome.