Ladies making more money than their men

I have a friend that has a hang-up about his lady making more money than he. He feels as if she feels like he is inferior simple because of that fact. But she has told him that it is not a big deal. I told him that he is blowing the situation out of proportion. I would be fine with a woman making more money than me. It wouldn’t make me feel inferior one bit. After all my efforts, I don’t know if I got through to him. Oh well, some people will never learn that using material things or money as a measuring stick in a relationship will definitely lead to undue stress.