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The inability to grasp why he can't just tell the truth, the feeling that it would be an injustice not to do so, is a classic gifted-with-ASD behavior.

I have observed that my DD participates appropriately in social white lies ("I love my present," "I like your drawing,"--when I know these things are not strictly true), but still has a compulsion to fix or speak up insistently about factual inaccuracies (eg, mispronunciations by her brother, worksheets containing spelling errors, someone getting a math fact wrong). I have wondered if some of this is anxiety-based, or possibly a personality/perfectionist thing. If SHE is wrong about something like that, she always wants to be corrected. A misspelled word in a writing exercise is absolutely not acceptable to her.