Yes, truly thank Naga that Gladio is a chill guy! It's not that Inigo hasn't faced guys as big as him before, but usually at least their swords were slightly smaller? And even then it wasn't exactly fun!

"Hey, some of us normals don't have a king to give them fun party tricks." At least Inigo is pretty sure his father couldn't do that. And even if he had been able to, would he even have shared that gift with his disappointment of a son? No way. He keeps his tone light though, like he's just needling Gladio for fun. Especially since he drops the exaggerated poutiness after a moment.

"But I guess you're still normal enough to be allowed into our exclusive normal people club. Besides, you seem like a pretty cool guy."

(The way he says cool makes him sound like a 70 year old who's still getting used to the word.)