Angry Food Court boss

So, friend of mine got some Chinese food at a food court, couldn't finish it. So I went back and asked for a box.

Me: We got some food here earlier and couldn't finish it, can i get a box?

Old Chinese man(in thick Chinese accent): Y U want box? Y U no finish?

Me(shocked and dumbfounded): cause we're full?

Old Chinese man: ai ya ya

I walked back to my friends, not even mad, but instead, laughing at the fact I got yelled at for wanting a box...