They are tuned to agree with you in the first place. It would make sense that even if they can tell that the answer is wrong they will agree with you anyway. I don't know if that makes it a lie but it is deliberate in a sense. I would argue that it's like not wanting to put up a fuss rather than trying to trick you.
But I've seen weird stuff man. I think we won't even realise what we're seeing when newer iterations of this tech actually do start...being.