Ari waved her hand. She knew that Aiden did not mean anything harsh by calling her Mrs Nelson. She said to him, "There is no need for you to apologize, Mister Dimitri and if it's too much trouble, you call me by my name."
She would rather not be questioned or accused of holding on to the Nelson name even after divorcing Noah. This was why Ari corrected Aiden, his action of calling her, 'Mrs Nelson' was not harmful but to some people like Ariel and Josie, it might be equivalent to her still clinging onto Noah.
Because Ari did not want to be harassed by either of those women, she hoped that Aiden would change his habits.
Aiden also understood her unsaid words. He nodded and acknowledged his mistakes before saying, "I understand, Ari. Now, can I have an Iced white mocha with caramel and salted cold foam?"
"Right away," Ari smiled at him as she accepted his order.