Something about that phrasing makes the SecUnit bristle, jaw grinding as it looks away from Jack. In its head it's offended over the unintentional parallel to calling it a monster, but that would require explaining - which it doesn't do. It just takes the chance to finally pry itself away from the vehicle it was using as a prop and maneuver around the man, continuing to keep its transformed arm on the far side from the man.

"Good luck talking to them next time."