Avram > What is considered respectful and what is not is highly subjective and depends on the parent and child in question.
A good point. Still, when bringing an abstract kid, he should follow basic halochos. I don’t want to throw quotations at you, I suggest you yourself look up halochos of talking to a parent and tell us how this matches. As a personal anecdote, once when my Father O’H brought up (yet another) “peshat” of a pasuk, I prepared to argue against (and it was fine, as you are saying), but then saw a supporting Rishon and told my father “approvingly” – XX says so also! And got an unexpected retort instead of praise: why are you bringing XX when your Father tells you? [and this is, of course, the halakha – you don’t praise the words of your parent not to create impression that you are worthy evaluating them]