Stupid
The Dao Lord pressed down his distaste. Mae had obviously ignored his earlier form of address because she saw it as a sign of disrespect, not because they had to refer to her by her last name, but because she had already told them all how to refer to her.
The fact these Dao Lords insisted on not doing wasn't a slight against her, but against her husband.
And that was intolerable.
She didn't yet have the strength to do so. But if it wasn't for this, she would have killed this Dao Lord in a single slap. This time, she could only let it slide because there was only so far her master's prestige could take her.
She didn't believe that it was a casual mistake. Dao Lords had practically infallible memory when it came to these things. There was no such thing as "slips" of the tongue at this layer. Unless his soul had suffered an injury or an attack, anything he said he had said on purpose.