At my first duty station it was much more tight-knit; we knew each other by first name, met off-hours as a group (including spouse and children), etc. So there it wasn't unusual to refer to someone's wife by first name.

Now I can see why people would be offended about referring to "the wife" (and it's less savory alternates), as if you were resigned to torturing yourself once you got home and not actually in a committed relationship with a human being. But that's not what is happening when talking about your actual wife, just as it's considered perfectly acceptable to refer to one's mother, brother, father, or sister by role instead of name.