What happens then if I'm a human that masquerades as a computer? Seems like a neat way of explaining away a number of social faux pas or drunk-dialling. "Me? Noooo... that must have been my PhoneBot 2000. Supposedly the next firmware update should solve that kind of problem."

That said, I don't necessarily disagree; there is going to need to be lots of these kind of issues that need sorting out before we reach a Culture-level of AI interaction.