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1.
A person who dosen't understand sarcasm in any way. They are always being realistic in such a way that it is annoying.
*people are looking at moss*

Person 1: I went to the Jay-Z concert!

Person 2: Yeah, and I'm Jesus.

Person 3: No you're not! Jesus lived so long ago! If you were Jesus, you would be In heaven right now, and I know that you will never get there!

Person 2: Wow. You are such a realistico. I was beng sarcastic.

Person 3: What's Sarcastic?

Also see:

Smart Aleck realistic sarcasm
by Lamaris The one and only April 15, 2010