Brooke's overestimation of people's reactions is known as the false consensus effect.
Explanation:
Researcher Lee Ross in the late 1970’s has done elaborate research in the field of psychology about cognitive bias. The outcome of the research was named as the false consensus effect. The definition of false consensus effect states that the consequence takes place when we misjudge the number of other people or the amount to which other people share our opinions, beliefs, and behaviors.
In some cases, individuals feel that there are some similarities with others which is not in actual case. An example of a false consensus effect is thinking that all people believe that saving the environment is important because you feel that way.
