Belligerently

He's acting belligerently.

They swaggered unsteadily but belligerently toward the bar and looked at Pete with bleared and blinking eyes.

“How’d you get a job like this?” she asked. “A fella got to eat,” he began; and then, belligerently, “A fella got a right to eat.”

In truth, Mrs. Lish’s charge of anti-Semitism had backfired with a number of the faculty, who were quite belligerently anti-Semitic themselves.