Should I talk to my friend?

I have a friend who is constantly belittling her husband. When he asked where my husband served a mission, my husband said "Chile" and immediately she says "yeah HE actually went foreign" as if serving stateside isn't as good. And every little thing he says to disagree with her she says "do you want to sleep on the couch?" He just gets quiet and doesn't stand up for himself.
My question is: should I talk to her about her rudeness? Or let it go?
If you have any advice please comment.

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