Why is this human so stubborn and needlessly aggressive?

Connor pauses and then backs up exactly one step, not realizing that he should've scooted further if he didn't want it to come off as passive-aggressive. He did, technically, back up. For a moment he looks confused - as confused as a machine of his caliber can get - with his eyebrows faintly knitting together and there's even a tiny furrow line forming between them as he studies the tension squaring Lieutenant Anderson's broad shoulders.

"I would discourage any violence or verbal altercations," Connor doesn't seem to know when to shut the fuck up. "The first can be expensive and the second unprofessional."