Why does Raymond pretend to be drunk help people cope with mixed marriage?

It seems you're referencing a specific character from a piece of media, but you haven't provided enough context for me to understand your question.

To help me understand what you're asking, please tell me:

* Who is Raymond? Is he a character from a book, movie, TV show, or something else?

* What is the context of his pretending to be drunk? What is he trying to achieve by doing this?

* What do you mean by "help people cope with mixed marriage"? Is he specifically helping people in mixed marriages, or is his behavior somehow related to them?

Once you provide more information, I'll be able to give you a more specific and helpful answer!