A public Glance

One word, understood where it matters.

“That,” he whispered, “is an outrageous insinuation.”

From The Visitor at Midnight, an original Verbalore reading.

Meaning here 01

insinuation

noun · /ɪnˌsɪnjuˈeɪʃən/

An unpleasant accusation or suggestion made indirectly.

Still unclear?

He means: you accused me without saying the accusation openly.

What the wording does

He tries to move the argument away from whether the accusation is true and towards whether it was polite. The narrator refuses that escape.