" As long as your father's alive, you aren't yet the duchess. All that deference isn't truly warranted, is it?"
In an oppressive tone, Lady Gertrude said, "My niece is the marchioness of Sherbourne and the future duchess, a position that warrants great respect among the ton. She is, in fact, frequently called Her Grace, and given all the privileges of her future rank."
He had been soundly rebuked, and he bowed his head in recognition of a worthy adversary.
"Whether or not he gives me the respect due to a duchess is of no importance," Madeline said with a flick of scorn. "Americans are not impressed with the aristocracy, or so they claim. One hopes, however, Mr. Knight behaves with suitable courtesy to other women he encounters- in all walks of life."
Yes, Lady Gertrude had rebuked him, but it was the contempt from his future wife that stung. "I'll do my best not to embarrass you."
"Do your best not to embarrass yourself," she said with icy composure. "

― Christina Dodd , One Kiss From You (Switching Places, #2)