I think you’re oversimplifying there a bit. Of course what you say is true about the bulk of people, but there are always a few who just want to hold court and tell people what to do.
“So, listen to what they say, nod, and smile.” is pretty close to grey rocking! I’d just add, try to avoid giving them prompts for speeches in the first place. I tend to keep the conversation light and avoid serious topics. I’ve become a master of “I’m leaving the college search to D”.
Also a bit of self-deprecation always seems to throw the advice givers off-for the person I have in mind in particular, if you’re not seriously talking up your own life choices then something seriously wrong.