eclipse~ it sounds rude, I guess, but more so disrespectful? but I think it’s just a way of not giving credence to the person’s unwanted advice. why would one give you more unwanted advice if you just basically put a ‘the end'(‘talk to the hand’) sign to the conversation? it’s showing that you have no interest in what was said, & that seems to be encouragement enough for no further convo.
it may seem harsh, but the example you gave was of a veryyy rude (passive-aggressive) yenta! :/