When the band took a break, Diehl grabbed a mic and introduced McCrory, who was greeted with a loud smattering of boos.
It wasn't the first time the former Charlotte mayor -- elected and re-elected seven times -- has heard boo birds in his hometown. In Charlotte, at least, the popular mayor has been a less popular governor.
This summer he appeared at a concert at the Bechtler Museum. When he was formally introduced, many in the audience booed.
Some thought Friday's birthday booing was rude.
"I thought it was in poor taste, but it happened," said attorney Ed Hinson. "I sure heard it."