Hunk was honestly just thrilled that the handshake was successful- it keeps being a thing that people do, regardless of where they're from. But, that wasn't what got Hunk's attention this time.

"Rude?" He cocks an eyebrow, a bit baffled at his new friend. "We both forgot, Prompto, so no need to apologize." And then his eyes grow a bit wider, and he winces just a bit. "Unless... should I apologize, too?"