I'm so glad Klaus is so kind; I likely would've (verbally) beaten this fool until he realized he wasn't in Japan... which might have caused serious (emotional) damage, as the MC is very, very stupid.
I get not understanding about the bag; there was no real information given to him about that, so the entire topic of the bag... I'd call a Mulligan, for sure.
But every other thing where he gets surprised has come from the MC'S complete inability to pay any kind of attention to the world around him in any way.
I mean... laughing about one's own ignorance is the height of stupidity when you're in an unknown land!
I cannot count the times I have heard the words:
"What the fuck are you laughing at, buddy?!"
... and then I know I have to save the poor idiot who thinks he can just laugh off a huge gaffe...
....
... cripes, it's giving me flashbacks, I swear...