Yeah, he doesn't understand the curse word, but then, he knows what the infliction and intonation tends to mean in other languages. Of which, Han is only fluent in a hand full. The primary language they speak seems to be coherient to each other.

It will only dawn on him a little later, that there must be some multiverse 'force' translating for everyone. He's still a little too shell shocked to process everything.

Anyway, this guy is strangely regimented in his speech. So he thinks military and if he's wearing the uniform, well, then it seems doubly likely. It's generally a respectful way to talk to people. Generally. The way he calls him 'captain', though, makes it sound like there's some contempt in there.

"It's just me, pal." He tries to reflect that attitude right back at him with the words. "And don't talk about my ship that way."