Lost in Translation

So, my supervisor took my whole research group out for a drink in the Student's Union. Talking to him in a noisy setting can be an ordeal, as he's Chinese and his accent is quite strong. Cue a very stilted conversation, and then this happened...

Him: So what’s different now you’re living with your parents again?
Me: Well, I don’t get to do as much cooking as I used to. It’s a shame, I really enjoy it.
Him: What?!
Me: Yes, but now my mother does far more than I do.
Him: Your mother? Well. Wow. I’m shocked. Really?
Me: Oh yes.
Him: And is it a common thing to do in England?
Me: Yes, of course, though not as much as it used to be. And I expect it is in China as well, surely? I take it you don’t do much yourself?
Him: [Splutters into beer]
Me: [Aware there's been a language issue, but not sure where it happened so struggling on] Does your wife cook instead? Does she tend to make Chinese food or more Western dishes?
Him: Cook? Cooking? Wait, you’re talking about cooking? As in, with food?
Me: Well, yes, isn’t that what we were discussing?
Him: Oh. Oh, I see. Yes, that makes more sense.
Me: So, what did you think we were talking about?
Him: Ah, well, you see, when you said cooking, I thought you said cocaine.