But..... usually that is a part of the Proper Protocol Training that government officials in high positions are given. Flag etiquette would, of course, be part of that.
I don’t know for sure, but I can see a briefer saying “Mr & Mrs. President, time for your Flag Etiquette and other Protocols.” and the two of them waving their hand in the air saying “Yes, yes, yes. We already know all of that stuff.”