I definitely find that I always always always have to be right/have the last word. However, I always put it down to being stubborn/ arrogant/ young and having to have the last word. I've been told that many grow out of it as they get older. I'm not sure if it's something that can be tagged back to ASD, for me.
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--Nyx-- What an astonishing thing a book is. Across the millennia, an author is speaking clearly and silently inside your head, directly to you... Carl Sagan