Kyrie Irving of the Boston Celtics looks on during the singing of the national anthem before the game against the New York Knicks at TD Garden on Oct. 24, 2017. (Photo by Maddie Meyer/Getty Images)

Kyrie Irving of the Boston Celtics looks on during the singing of the national anthem before the game against the New York Knicks at TD Garden on Oct. 24, 2017. (Photo by Maddie Meyer/Getty Images)