Answer:
pluralistic ignorance
Step-by-step explanation:
Pluralistic ignorance: In psychology, the term "pluralistic ignorance" is described as a specific situation whereby the majority of different group members tends to reject a particular norm secretly or privately yet go along with the given norms because the people involved assumes in a wrong way that other have accepted it.
Pluralistic ignorance is also determined as "no person believes yet every different person thinks that the other person believes".
In the question above, the given case is described as pluralistic ignorance.