The most remarkable thing about the Supreme Court’s opinions announced Monday was not what the justices wrote or said. It was what Samuel Alito did.

The associate justice, a George W. Bush appointee, read two opinions, both 5-4 decisions that split the court along its usual right-left divide. But Alito didn’t stop there. When Justice Ruth Bader Ginsburg read her dissent from the bench, Alito visibly mocked his colleague.

Ginsburg, the second woman to serve on the high court, was making her argument about how the majority opinion made it easier for sexual harassment to occur in the workplace when Alito, seated immediately to Ginsburg’s left, shook his head from side to side in disagreement, rolled his eyes and looked at the ceiling.

His treatment of the 80-year-old Ginsburg, 17 years his elder and with 13 years more seniority, was a curious display of judicial temperament or, more accurately, judicial intemperance. Typically, justices state their differences in words — and Alito, as it happens, had just spoken several hundred of his own from the bench. But he frequently supplements words with middle-school gestures.

This guy needs to go to the principal’s office. Sam is a big boy now and really should know better.

Shame.