Yunxi causing trouble

Yunxi's countenance changed and she abruptly turned in the direction of the person who just abused her mother. She assessed the woman and then curled her lips.

"Madam Fu, I'd advise you don't say unintelligent things about others in public because you might anger someone and drive them to wash your dirty linen in public."

The woman addressed as Madam Fu looked rich with all the accessories and the quality of her orange dress.

Her face felt hot after hearing Yunxi's words. What does she not understand? Yunxi might sound 'polite' but everyone knows that she just insulted her.

Yunxi called her words unintelligent and speaking unintelligently means someone has no knowledge of the topic and that is mostly associated with ignorant people. Isn't Yunxi calling her foolish, dumb, senseless, idiotic, and unsophisticated even though she presents herself as a learned woman?