He thought she was being silly, yes. Damn immature, even. But not stupid. He reserved 'stupid' for eco-terrorists and Mako.

"I also come from a world where, if I don't pay attention, I'm dead in less than a heartbeat," Reno noted. "You gonna refuse to respect all your teachers, Ino? You're the student, they're they guys in charge. Goin' to class is doin' the job. You don't gotta like what they have to say, and they don't gotta give a shit, but the job's still gotta get done."