OK, it is customary for the right hand over the heart when the National anthem is performed. while I can recall a time when removal of the man's hat was the respectful response to the playing of the anthem, but somehow the show of respect has flourished into the hand over the heart stature. We can also assume the First Family was prepped from their balcony appearance with a reminder to "hand over the heart." How could this happen?
While literally addressing the world, Trump finds cause to go "family."
Why do you think Trump took the cap from a kid who wanted a signature, signed the hat and then threw it to the walking line instead of giving it back to the kid?
And he appeared to laugh after failing to return the hat to the kid.