It would have been informative to have the reporter interview some of the people who completed the oaths and get their “take” on it.
Seems like the standing ovation would make clear the point that it was the reference to the “President” that brought the boo’s - and that the men/women themselves were being honored.
Interestingly, the city of Columbia is one of the 3 most liberal areas of the state. Of course many of those at the football game don't live in Columbia...wonder if they would have booed if it had happened at a soccer game?