Well, I may be wrong, but I got the impression after I told you why an LGBT might not want to have a wife referred to as a partner that you weren't going to change that behavior with others.
Confused?
It's not a demand. PC is NOT about making demands. It's about being culturally sensitive and letting groups that are formerly oppressed self-empower.
Of course, you wouldn't be expected to do something totally out of your own comfort zone.
My next door neighbors are gay, great guys, and good friends and neighbors. I don't have to walk on eggs around them to avoid offending them and I appreciate that a lot. They are married and they refer to each other as partners. Who am I or who are you to say they have to use another word? I sometimes refer to my husband as my 'best friend' or 'my partner' or 'hubby' or 'husband' or 'significant other' or 'the guy I sleep with.' Who is to say what is the acceptable term to use?
If you consider any other word than 'wife' acceptable for your mate, I can't do anything about that. If I think about it, I would try to accommodate you but frankly I don't see it as that big a deal myself. And I would feel like I had to walk on eggs around you instead of feeling like you accept me for who and what I am.