Prompto said he was fine, but Hunk got him to endorse a joyride through the Curti streets. It's clear he's not fine, especially with how talkative he isn't being. So the Gourmand looks decidedly unconvinced.

"Still kinda what?" Now Hunk just stares. You're on the spot now, Prompto. You shouldn't have kept talking, but... Drunk people make Mistakes. "Should I keep driving? Or do you wanna talk about it? If-" He startles himself a bit. "If you want to. No pressure!"

But it seems like he wants to talk about something.