Originally Posted by
PollyOliver
Not every objection is disrespectful, and not every question about your rulings is intended to undermine you. It might be disrupting--in fact, it probably is--but I wouldn't start from the premise that the player is trying to undermine you or show your disrespect, but rather that they, as someone who also DMs, cares about getting it right, and that they're acting on that without really thinking about how it affects your ability to keep the game running. So by all means, approach them about it, but I'd start by keeping in mind that they probably aren't trying to undermine you. Point out how it would feel if you did the same when they were DMing and how it affects your ability to keep the game moving, and hopefully they will understand.