Reactivity: In psychology, the term "reactivity" is described as a phenomenon that tends to occur or happen when a person ought to alter or change his or her behavior or performance due to the awareness of the person that he or she is being watched or observed by the other person. However, the changes related to this phenomenon can be a negative or a positive change and completely depends on the situation itself in which the person is being observed.
In the question above, the given statement signifies reactivity.
The office of the president of the United States has grown have too much authority. ... Let's install a king instead ... If the Broadway musical “Hamilton” did not make you laugh at the diminished and divorced-from-reality kingly ...