Controversial take (only if you're a liberal who believes in crap like 'people can be born gay or trans and never ever be straight'):
I believe that a person is not 100% defined by whoever that person is living with and whatever that person's gender is. I believe that a person can be rightly defined by the good deeds of that person and if lots of other people think that person is actually quite sweet.
If that person is good all on his or her own, then why the living, breathing hell should it matter who that person is living with regardless of gender? And why should we be forced to let whoever that person is living with ultimately define him or her?
If you believe that we need to ultimately let whoever 1 person is living with and is supposidly married to to define who that person really is and should ONLY care about that 1 fact, then you're a fucking idiot who thinks we should all be ultimately defined by who we choose to be with instead of our good deeds.