Hello Sueh
You probably won't like my answer.
In my opinion, whether he is an Aspie or not doesn't really matter. Since that person is not your husband and I am guessing you are a guest in his house (or am I wrong?), there is just not much you can do about it. I agree that his attitude about the language is too rigid, but it is his house and therefore he is entitled to his opinion, it is his decision. Best you can do is ask for a compromise for the time being, tell him that you are willing to learn his language (if you are willing of course) but that it will take time, and ask him if you could use english for the words that you can't say in his language yet (which he may disagree with).
If this doesn't works then I guess what you can do is go outside to talk with the ones you want to have a conversation with
I just don't think there is much you can do, I'm sorry, but maybe others will have good ideas/advices.
Shadi
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That's the way things come clear. All of a sudden. And then you realize how obvious they've been all along. ~Madeleine L'Engle