My husband once managed to upset a rather politically correct couple over this one. He was taking part in a drumming workshop and, during the break, began to chat with this couple about various things, including me, his wife.
He was asked, "doesn't she mind you referring to her as your wife, and not your partner?"
He did explain that it was, actually, my relationship to him, and he'd no more describe me as his partner than he'd describe his brother as his sibling or his son as his offspring.
They kinda didn't make any small talk with him after that.