From a White House spokesperson:

"While the White House does not control the conduct of guests at receptions, we certainly expect that all attendees conduct themselves in a respectful manner. Most all do," Shin Inouye, a White House spokesman, said. "These individuals clearly did not. Behavior like this doesn’t belong anywhere, least of all in the White House."
Credit where credit's due. At least the official position was to rebuke these individuals.