Now, I know most pet peeves are oddly specific. But I have one that a little too specific, and I often don't say what it is or why it bothers me.
'Hi not bad for a robot - signed Asshole'
My name in all lower case letters. Your name properly cased.
I HATE THAT SOOOOO MUCH. It drives me bonkers. What you are too fucking lazy to write my name in proper format? Or you think that you are more important me? FUCK YOU.
Immediately my response to the use of lower case letter for my entire name is:
"I AM NOT A SUBMISSIVE!!!"
and I of course don't say that, because that would require explaining.