Steve is definitely more than a little stubborn, but it'd only ever just bothered Tony if he pushed it too far. But he's thinking that maybe he had pushed him too far with something else. He taps his arm as if to show Tony that he doesn't really believe him, but he'll let that go for now. He doesn't think their spat will boil over yet.

"I wouldn't rather hear it from anyone else, Tony, it's just information." He flips his tail back and forth, not sure if it's worth pursuing, but also thinking that the more Tony hides the information, the more suspicious he gets.