Why do you always call Mr. Jiang Yang?

Mr. Wang is a title of respect for a learned or respected person, regardless of gender. It seems that the level of teachers in universities is not as good as that of "Mr." Although they are all teachers, not all teachers can be called "Mr." Only highly respected teachers deserve the title of "Mr."

It seems that a lady is just a gentleman's address. Besides, isn't it better to call Jiang Yang a gentleman than a lady to reflect her academic achievements? Otherwise, as several ladies usually walk together, is it more polite for Jiang Yang to be called a gentleman?