[Salieri's expression goes a bit hard at that, and his voice goes a bit sterner]

I am not patronizing you and quite frankly, mademoiselle, I am insulted that you would think so.

[he straightens in his chair, looking at her intently]

A true professional must take a well-rounded view of their performance in order to properly consider every angle with a fair and unbiased view. I've seen enough performers in my time become obsessed with critiquing themselves without the balance of acknowledging the better parts of their performance, and they and their art always suffer for it.