DD8 does this arguing all the time and drives me crazy (the sky isn't blue, no I don't want ice cream, no that's not the right answer to my homework question, etc.). She's been doing it for years and for a while it was so bad I thought it was part of her SPD (seriously!!!). I never thought it could be a gifted thing. The mere idea that it might be "normal" is actually quite comforting. (Maybe it's being the daughter of two lawyers? though we don't usually argue like that at home.) Along the same lines, unfortunately she's also amazingly good at catching me everytime I try to offer a simple explanation to get someone off my back about how/why; I usually end up with "well then go ask daddy!"