Assuming you’re fortunate enough to have investors, one of the things they’ll do is give you advice — solicited and unsolicited. And since your investors are smart, you should listen to everything they have to say, right? Wrong.
Glibness, whether in the form of a remark or a smirk, is a disease that infiltrates multiple industries. People would rather work with others who know what they're talking about, have respect for others, and who seek useful outcomes.