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This read as sarcasm to me. Isn't there a name for not being able to distinguish parody and sarcasm?

http://en.wikipedia.org/wiki/Poe's_law is the inability to distinguish between parody of, and sincerity in, extremism.

I can't thin of anything in English, but I'm reminded of this Russian word. http://betterthanenglish.com/stiob-russian/