That's not genuine enough. They're not seeing anything behind that lost smile. He's still...too calm, no matter who he is.

(Replica-Frisk fidgets, body language showing they want to be anywhere else. It's a pity they can't be too far from Frisk without being forced right back nearby.)

They tilt their head, smoothing their small scowl from their face. Fine, they'll drop the puppet thing. They wanted to do that anyway. "Frustrated? 'Bout what?" What's wrong, just tell them!